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(Click for frequent words.) 58 Susanne Shultz 56 Welbergen 55 van Wyhe 55 Fiadjoe 55 Kathy Belov 54 Fred Kavalier 54 Meave Leakey 54 John Neoptolemos 53 Charmaine Griffiths 53 O'Connell Rodwell 53 Kaleebu 53 Dominey Howes 52 Emma Mbua 52 Sinervo 52 Tim Coughlin MAusIMM 52 Courtenay Bartholomew 52 Caitlin O'Connell Rodwell 52 Daniel Nettle 52 Parnia 52 Frans de Waal 52 Linda Calabresi 52 Andrew Balmford 52 Zilhao 52 Elvis Ngolle Ngolle 52 Brad Duchaine 52 Nir Barzilai 51 Kenneth Shorrock 51 Mark Hindell 51 Keith Hamer 51 Wolf Reik 51 Rabeling 51 Raxworthy 50 Qazi Rahman 50 Paul Thornalley 50 James Le Fanu 50 Dr. Chodick 50 Maselko 50 Sefa Dedeh 50 Mwandosya 50 Andrew Hattersley 50 Challinger 50 Shamay Tsoory 50 Obafunwa 50 Peter Vanezis 50 Pushpangadan 50 Yash Tandon 50 Robert Booy 49 Henshilwood 49 Hublin 49 Mwatha 49 ethologist 49 Jerry Coovadia 49 Roger Mugford 49 Roenneberg 49 Justin Brashares 49 Prakash Kothari 49 van der Steeg 49 Peter Weissberg 49 Stephen O'Rahilly 49 Dora Biro 49 Michael Leitzmann 49 Makinda 49 Hsee 49 Boris Pasche 49 Papiya Ghosh 49 Dangour 49 Hotamisligil 49 Melov 49 Guy Rutty 49 Sánchez Alvarado 49 Alphey 49 Andrew DeWoody 49 Fatoyinbo 49 Vladimir Antwi Danso 49 Greger Larson 49 Anzala 49 Robert Hegele 49 Lummaa 49 Liz Slooten 49 Shahram Akbarzadeh 49 Frits Rosendaal 48 Shamloul 48 Jibunoh 48 Jacky Boivin 48 Aruna Broota 48 Bredella 48 Gyan Baffuor 48 Tony Wyss Coray 48 Binsar Sitanggang 48 Thatje 48 Colin Baigent 48 Hoosen Coovadia 48 Marambaud 48 Leon Flicker 48 snubfin dolphin 48 Alan Cowman 48 Kibale National 48 Tekeda 48 neuro psychiatrist 48 Wailoo 48 Marilyn Renfree 48 Colin Espie 48 Polychronakos 48 Sacktor 48 Barratt Boyes 48 Vermeij 48 Kimenyi 48 Stefan Willich 48 ffrench Constant 48 Icipe 48 Martin Scurr 48 James Whisstock 48 Iftikhar Baloch 48 Trinajstic 48 Panksepp 48 Routy 48 Clive Seale 48 Willerslev 48 Wolfgang Haak 48 Aguzzi 48 Ockelford 48 Cecilia Ramlau Hansen 48 Gombe Stream 48 Courtenay Latimer 48 Kihansi spray toad 48 Sylvia Tamale 48 Du Pisani 48 Jane Ussher 47 Dhabhar 47 Dr. Koenekoop 47 Jill Belch 47 Ap Dijksterhuis 47 Hamish Pritchard 47 behaving abnormally 47 Südhof 47 Nigel Raine 47 Jay Belsky 47 Hugh Possingham 47 Weese Mayer 47 Christiaan Bernard 47 Pikaard 47 Neri Laufer 47 Convit 47 Cynthia McVey 47 Tibballs 47 Bengt Winblad 47 Ershaghi 47 Julian Peto 47 Bhui 47 Azim Surani 47 Samir Brahmachari 47 Ghanem Al Hajri 47 Irene Pepperberg 47 Guldberg 47 Skorecki 47 Nolen Hoeksema 47 Froguel 47 Karl Swedberg 47 Wilcove 47 Gavin Prideaux 47 Sekercioglu 47 Eske Willerslev 47 Jacques Donnez 47 Danovaro 47 Christine Huffard 47 Arnold Kriegstein 47 Petra Boynton 47 Izpisúa Belmonte 47 Inzlicht 47 van der Schouw 47 Shamban 47 Ab Osterhaus 47 Manevitz 47 Mbi 47 Andrew Rambaut 47 Whisstock 47 Keedwell 47 Tiganis 47 Animal Behaviour 47 Michel Odent 47 Barry Chevannes 47 Magoha 47 Robert Sapolsky 47 Birch Machin 46 Stephanie Belloc 46 Krycer 46 Giulio Maria Pasinetti 46 Manfred Kayser 46 El Deiry 46 Seshiah 46 CSIRO Entomology 46 Michael Pollanen 46 Odent 46 Ojowu 46 Freda Briggs 46 Alan Handyside 46 Ingrid van Heerden 46 Yohannes Haile Selassie 46 Jane Wardle 46 Ele Ferrannini 46 Darkoh 46 Hindell 46 Kew Jodrell Laboratory 46 Satoshi Kanazawa 46 Anushka Patel 46 El Sohemy 46 Filep 46 Massague 46 Caruana Galizia 46 Elisabeth Cardis 46 Rajiv Jalan 46 Stephen Westaby 46 Daan Kromhout 46 Paavonen 46 Jaslin Salmon 46 Katherine Belov 46 Lee Grismer 46 Raphael Mechoulam 46 Emmanuel Skordalakes 46 Houssami 46 Simon LeVay 46 Ben Barres 46 Musiba 46 Death Jayant Patel 46 Tan Kai Chah 46 Primatologist 46 Lesley McCowan 46 Mika Kivimaki 46 Karim Nayernia 46 Hans Peter Uerpmann 46 Oxford virologist 46 Mackay Sim 46 palaeoanthropologist 46 mycosis 46 RS Shetty 46 Birmaher 46 Alison Kock 46 Alex Yellowlees 46 Goka 46 De Brazza 46 Edinburgh Roslin Institute 46 Niringiye 45 Hertzel Gerstein 45 journal Evolutionary Psychology 45 Muller Landau 45 primatologist Frans de Waal 45 Sekajugo 45 Fereydoon Abbasi 45 Maestripieri 45 Mukamel 45 Louis Leakey 45 Sekaly 45 Shlipak 45 Kubanek 45 Nick Neave 45 Amit Nathwani 45 Sarah Jayne Blakemore 45 Luke Alphey 45 Aric Sigman 45 Antonio Lanzavecchia 45 Knottenbelt 45 Syed Anwar Hossain 45 McConvill 45 Kunle Lawal 45 Sangay Wangchuk 45 McFall Ngai 45 Elizabeth Nabel director 45 Professor Morwood 45 Ludeki Chweya 45 Rando Allikmets 45 Forensic pathologists 45 Katelaris 45 Ditzen 45 Nyende 45 Mithen 45 Al Qadasi 45 Koletzko 45 Baccarelli 45 Madhyastha 45 Johan Auwerx 45 Jorm 45 Colin McGuckin 45 Simin Nikbin Meydani 45 Priyamvada Natarajan 45 Amitabh Kundu 45 Diwekar 45 Goldbach Mansky 45 Pääbo 45 Mark Shucksmith 45 Juan Carlos Izpisúa Belmonte 45 Kate Bushby 45 Giwercman 45 Ulrich Lai 45 Oreopoulos 45 Geraint Rees 45 Kutluk Oktay 45 Denis MacEoin 45 Claude Lavigne 45 WAIMR 45 Chapkin 45 Jaap Goudsmit 45 George Ebers 45 Terence Chong 45 Mike Morwood 45 Eva Schernhammer 45 Peter Braude 45 Boahen 45 Adrian Raine 45 Roger Pertwee 45 Perception Lab 45 Kathiresan 45 Tabashnik 45 albino ratfish 45 Ken Veteto 45 De Roure 45 journal Behavioural Ecology 45 Stickgold 45 Mrs Dowler 45 fetal microchimerism 45 Barbara Sahakian 45 Jean Pierre Routy 45 Weimbs 45 Coral bleaching 45 Krishnan Bhaskaran 45 Buggi 45 Margolskee 44 Leendertz 44 Komisaruk 44 Bossou 44 asexual organisms 44 Tuomilehto 44 Govinda Raju 44 Uauy 44 Karin Michels 44 Maleszka 44 Karumanchi 44 Wischik 44 Frisén 44 Dr Rama Kant 44 Abdul Ruff Colachal 44 Mathias Treier 44 Zeuzem 44 Professor Jake Najman 44 palaeontology 44 Valter Longo 44 Claus Yding Andersen 44 Chavarro 44 Barré Sinoussi 44 Simon Fishel 44 CIFOR 44 Langmore 44 Schoppe Sullivan 44 Diabetes Centre ICLDC 44 Abdul Ghani Butt 44 Ingrid Roscoe 44 Okujagu 44 Lynn Margulis 44 brevirostris 44 Mallavarapu 44 Aronen 44 Leishmania parasites 44 Fred Spoor 44 Kiyiapi 44 John Skehel 44 Ian Fentiman 44 Pavord 44 MBBS MPH 44 Sir Ian Wilmut 44 Roi Cohen Kadosh 44 hunter gatherer cultures 44 Ofori Sarpong 44 Samuel Wickline 44 Amar Agarwal 44 Varki 44 microchimerism 44 primatology 44 Youngner 44 inattentional blindness 44 Auwerx 44 sympatric speciation 44 Pier Paolo Pandolfi 44 Morris Ogenga Latigo 44 Hideto Sonoda 44 Sigmundsson 44 Dolores Malaspina 44 Ade Ajayi 44 Ian Crute 44 Dr Bleaney 44 Nwakanma 44 evolutionary adaptations 44 Ariel Revel 44 George Christophides 44 Mitchison 44 Dr. Manfred Beilharz 44 Shahin Rafii 44 Carlo Fonseka 44 Peter Collignon 44 Schiestl 44 Konje 44 Beate Ditzen 44 Louann Brizendine 44 Joseph Hibbeln 44 Mendle 44 van Dellen 44 Janet Werker 44 Ancrenaz 44 Violari 44 epigenetic changes 44 Malcolm McCrae virologist 44 Robert Vrijenhoek 44 Louise Leakey 44 Kolkata Jadavpur 44 Amin Saikal 44 Prof Wilmut 44 Stockigt 44 Andrew Grulich 44 Ponsiano 44 Dianne Neumark Sztainer 44 Anthony Swerdlow 44 Shorvon 44 Sivathasan 44 Dimitrios Trichopoulos 44 Graeme Pearman 44 Sharlip 43 avifauna 43 Mbororo 43 Consultant pediatrician 43 Peter Klinken 43 Bar Chama 43 Steven Austad 43 Parcak 43 Jeffrey Gafoor 43 Nik Mustapha 43 Dariusz Leszczynski 43 Karolinska Institutet Stockholm Sweden 43 Colin Blakemore 43 Spruit 43 Abdul Ahad Wani 43 Strully 43 Hutchful 43 Neil McKeganey 43 Todd Braver 43 Yeravdekar 43 Ramjee 43 Martin Sommerkorn 43 Ajit Varki 43 Comparative genomics 43 Andrew Wyrobek 43 Jeffrey Ellenbogen 43 Chris Idzikowski 43 Gita Ramjee 43 Marbán 43 Disis 43 Eric Vilain 43 Evolutionary biologists 43 Angela Genge 43 Kibenge 43 Anya Hurlbert 43 Velicer 43 Shresta 43 Suntharalingam 43 Andrew Kakabadse 43 BBSRC funded 43 Sharlin 43 Manoranjan Mohanty 43 Justin Halberda 43 Birditt 43 Traub Dargatz 43 Lianne Parkin 43 Dutney 43 Evolutionary psychologists 43 Kruetzen 43 Tim Frayling 43 Yehuda Hiss 43 Nickolas Papadopoulos 43 Vakabua 43 Yellowlees 43 Raditladi 43 Maciej Henneberg 43 Shashank Shah 43 Innes Asher 43 neural degeneration 43 Professor Colin Blakemore 43 Baulcombe 43 Salim Abdool Karim 43 Jurgen Rehm 43 Alan Silman 43 Sabine Begall 43 PU H# 43 Kiecolt Glaser 43 Ron Grunstein 43 Magdi Yacoub 43 Mark Tarnopolsky 43 Ove Hoegh Guldberg 43 Diane Fossey 43 earliest hominid 43 Wurtman 43 Emmanuel Mignot 43 Sharon Moalem 43 Nishikura 43 Robin Shattock 43 Russell Cowburn 43 Alan Kingsman 43 Evolutionary biology 43 Karolinska Institute Stockholm 43 Jon Fraenkel 43 Yiftachel 43 Professor Fentiman 43 Gajek 43 Pérez López 43 Tipu Aziz 43 Shiv Visvanathan 43 pygmy hippos 43 Simner 43 Markram 43 Shuang Zhang 43 Jesse Mugambi 43 underlying molecular mechanisms 43 Deborah Zarin 43 Pete Vukusic 43 Dr Sigman 43 Sabyasachi Bhattacharya 43 Rakison 43 Pantridge 43 Mick Clout 43 Ms Wambui 43 Arbiser 43 Kohwi Shigematsu 43 Sejnowski 43 Lawrence Addicott 43 CSIRO Livestock Industries 43 Goadsby 43 Ropper 43 Rudwick 43 Woolcock Institute 43 Kakabadse 43 co proxamol tablets 43 journal Carcinogenesis 43 Shenassa 43 Durado Brooks 43 Dr. Groopman 43 assortative mating 43 Jordan Grafman 43 Lida Pet Soede 43 John Toumbourou 43 van der Lely 43 Zheng Cui 43 Samms Vaughan 43 Dr Kumbour 43 Leakeys 43 Levi Garraway 43 Schloenhardt 43 Cohen Kadosh 42 Rupert Sheldrake 42 George Armelagos 42 Margaret Karagas 42 John Sulston 42 Ari Melnick 42 Gomani 42 male pipefish 42 Nutbeam 42 Ron Fouchier 42 Michael Inzlicht 42 Bosumtwi 42 polygraphic test 42 ESR forensic 42 Jayashri Kulkarni 42 Professor Chandra Wickramasinghe 42 paleoanthropologist 42 Asis Datta 42 UQ Diamantina Institute 42 Oliver Marc Hartwich 42 Shiekhattar 42 Raman Bedi 42 Dr. Gianni Belcaro 42 Fackson Banda 42 Veterinary Preventive Medicine 42 Mick Bhatia 42 Ofori Adjei 42 Blobel 42 Tollefsbol 42 Shuming Nie 42 Songtao Shi 42 Christos Mantzoros 42 David Stuckler 42 Anthony Mbewu 42 Professor Quian Quiroga 42 Itescu 42 Selhub 42 Beulens 42 Seeram 42 Bruce Headey 42 Simutanyi 42 Turkov 42 AV Narasimha Murthy 42 Miach 42 Dominique Lecomte 42 Giuseppe Fortuni 42 Shane Ebert P.Geo 42 NCHECR 42 Elizabeth Saewyc 42 Sir Mark Walport 42 Paediatrician 42 Mahasarakham University 42 Moira Hamlin 42 Rami Burstein 42 Albert Mehrabian 42 Lennart Mucke MD 42 Post mortem examination 42 Bruce Spiegelman 42 Volmink 42 Mrsic Flogel 42 Richie Poulton 42 Tony Tiganis 42 Jongnarangsin 42 Savulescu 42 Rebecca Garten 42 de Jongste 42 Mike Raupach 42 Soma Ghosh 42 Nongxa 42 Detlef Weigel 42 Madhusree Mukerjee 42 Morewedge 42 Jonathan Winickoff 42 Sherris 42 Laurence Klotz 42 Bisti 42 Schöler 42 Mootha 42 Eduardo Villamor 42 Coral reef 42 Tyring 42 Gerald Weissmann 42 Gervain 42 Hans Selye 42 Amminger 42 Augustus Nuwagaba 42 Fidock 42 Gavin Giovannoni 42 Dr. Hakon Hakonarson 42 hermaphroditism 42 Jacques Montplaisir 42 Sabine Bahn 42 Naomi Eisenberger 42 Marcia Stefanick 42 Wocial 42 Karl Skorecki 42 Condic 42 Emily Oken 42 Ancoli Israel 42 Przeworski 42 Macklis 42 Anjali Chhabria 42 Jimmy Suttie 42 Axel Bruns 42 Dr. Gurbel 42 Dhurandhar 42 Samer Hattar 42 Malalasekera 42 Aja Nwachuku 42 Turkana Basin 42 Leenen 42 Arpad Pusztai 42 Dick van Velzen 42 CEMACH 42 Jean Yves Reginster 42 Giulio Tononi 42 bdelloid rotifers 42 Baffour Awuah 42 Dr. Yolton 42 QIMR 42 Debinski 42 Andreas Meyer Lindenberg 42 Arroll 42 Tschöp 42 Tessier Lavigne 42 Priya Ramnath 42 Ivan Kempson 42 Omenn 42 Imre Janszky 42 Nicoli Nattrass 42 Kenneth Kinzler 42 Howard Florey Institute 42 Iffat Kamal 42 Ekoko 42 Karanja Njoroge 41 Jean Pierre Despres 41 Carpten 41 Tom Misteli 41 Rodrigo Quian Quiroga 41 Sameer Parikh 41 Matthias Mehl 41 Osvaldo Almeida 41 Jamrozik 41 Lewis Dartnell 41 Parpola 41 Rosemary Johann Liang 41 Guoping Feng 41 Judith Wurtman 41 Eric Prystowsky 41 Lu Qi 41 Ramayya 41 Animal Cognition 41 Abram Hoffer 41 Rene Bernards 41 Francesca Cordeiro 41 Diabetic Medicine 41 Professor Valerie Beral 41 Koobi Fora 41 Felitti 41 Pam Spurr 41 Ros Eeles 41 Humac Laboratories 41 Issels 41 Elena Elkin 41 Randy Jirtle 41 Shantha Rajaratnam 41 Pericak Vance 41 Hashibe 41 Kadiatu 41 Andrew Shennan 41 Francine Kaufman 41 Catherine Lumby 41 Robert Plomin 41 Mitchell Krucoff 41 journal Animal Behaviour 41 Kerstin Lindblad Toh 41 Biology Letters 41 hominid footprints 41 Davison Rowley 41 Towfigh 41 Pusztai 41 Rany Shamloul 41 Petrol sniffing 41 Gobabeb 41 Saltin 41 Esmon 41 Ferraretto 41 Stuart Butchart 41 Mason Durie 41 Kaimowitz 41 Susana Martinez Conde 41 Dahrendorf 41 Yvonne Linney 41 Neil Scolding 41 Rebecca Kippen 41 Pasarica 41 Adriano Aguzzi 41 Geoffrey Boulton 41 Kaarin Anstey 41 Dr. Daniel Offen 41 Ogbuanu 41 Retrovirology 41 David Servan Schreiber 41 Umayalpuram 41 genetically predetermined 41 hookworm infection 41 Janet Rossant 41 Kheifets 41 Seth Pollak 41 Graham Archard 41 Gabriel Zada neurosurgeon 41 Padwal 41 Quarraisha Abdool Karim 41 Sinharaja 41 Nicholas Conard 41 Alice Dreger 41 Anu Patel 41 Karin Ried 41 Archana Singh Manoux 41 Australian aborigines 41 Jane Visvader 41 Maasai tribe 41 neuroendocrinology 41 PCOD 41 Dirk Brockmann 41 Calmy 41 Prof Beddington 41 Cordelia Fine 41 Hingorrany 41 Habasonda 41 David Siveter 41 Diarrhoeal Disease Research 41 Romshoo 41 Brean Hammond 41 Fondebrider 41 Yury Verlinsky 41 Dijksterhuis 41 Sasieni 41 Janet Daling 41 Nancy Etcoff 41 M. Califf 41 Poutanen 41 Philip Steer BJOG 41 Julius Kelp 41 Murari Lal 41 Nayernia 41 heritable trait 41 Etcoff 41 Hughes Fulford 41 Cheresh 41 Analysis Kippra 41 Patrizia Stefanoni 41 Kapuya 41 Raymond Tallis 41 Nikolay Ovcharov 41 Greengard lab 41 Janet Monge 41 Kadan Lottick 41 Sian Beilock 41 Mark Walport 41 Mohammed Hossein Nasr 41 Lynda Chin 41 Soffritti 41 du Sautoy 41 Microscopic examination 41 Ronald DePinho 41 Decety 41 Zrinzo 41 Michel Brunet 41 Macklon 41 Wari Bateshwar 41 Arpad Vass 41 Dr Harish Shetty 41 evolutionary origins 41 ICRAF 40 de Vaus 40 Petford 40 Prassad 40 Schlaggar 40 Aziz Zadeh 40 Jayawardhana 40 Mesulam 40 molecular phylogenetic 40 Wijeysundera 40 Psycho Oncology 40 Jackie Sebire 40 Georgina Mace 40 Carmeliet 40 Ravussin 40 Herman Scholtz 40 Rudolph Tanzi 40 Stanley Falkow 40 Amasino 40 David van Gend 40 Henry Nields 40 Kuppermann 40 Warzak 40 journal Cerebral Cortex 40 Sadayappan 40 Felix Umansky 40 Louise Baur 40 Alpha Wurie 40 Chandawarkar 40 Richard Lewontin 40 Dr Miodrag Stojkovic 40 Sodroski 40 Van Eenennaam 40 Olduvai Gorge 40 Thomas Tuschl 40 Miodrag Stojkovic 40 Bamileke 40 Infection Biology 40 Possamai 40 Ulrike Peters 40 Rhincodon typus 40 Dr. Rivella 40 Mudumalai Wildlife Sanctuary 40 Habituation 40 Erik Selvig 40 Qi Zhou 40 Chandalia 40 Prof. Daniel Offen 40 Nottebohm 40 Dr. Jai Rup 40 Doron Behar 40 Vini Khurana 40 Louis Ignarro 40 Gerard Labuschagne 40 Krishna Shenoy 40 Zoloth 40 Gary Arendash 40 Dr. Moscona 40 Sarah Tishkoff 40 Dr. Laura Niklason 40 Jean Christophe Vie 40 Huffnagle 40 Jean Louis Sebagh 40 Dr. Rafii 40 Yosipovitch 40 Joan Borysenko 40 Schandl 40 Larom 40 tumor immunology 40 van Weel 40 Michael Omolewa 40 Jerschow 40 Daryl Bem 40 MSBP 40 Paul Spoonley 40 Geological Surveys 40 Kihansi Spray Toad 40 Jo Handelsman 40 Anita Thapar 40 Mayo Clinic hematologist 40 Fenaux 40 Ran Barkai 40 Stephen Badylak 40 Sarkadi 40 BMC Neuroscience 40 Le Tensorer 40 Anil Potti 40 Herbie Newell 40 Paul Grabb 40 Yunsheng Ma 40 Tarantal 40 Rasenick 40 Stapledon 40 Kritchevsky 40 Nusse 40 Lidia Morawska 40 Human Reproduction journal 40 Vo Tong Xuan 40 Christian Homsy 40 Rodolfo Stavenhagen 40 Pinto Duschinsky 40 Else Quest 40 Lencz 40 journal Ethology 40 Ahmed El Sohemy 40 Dava Newman 40 Ryeom 40 Vlachopoulos 40 Fadel Zeidan 40 Amy Arnsten 40 anamensis 40 Niamh Brennan 40 Duncan Wingham 40 Crispin Odhiambo Mbai 40 Mandyam Srinivasan 40 Sarah Werning 40 Westneat 40 Crossick 40 Iziko South 40 Mihail Konstantinov 40 Bruno Sobral 40 Carlos Frenk 40 Ngolle 40 Mark Walport director 40 journal PNAS 40 Klaus Stöhr 40 RLEK 40 Grant Ingrams 40 Benjamin Libet 40 Hakon Hakonarson 40 Smolskaya 40 Jhazbhay 40 histologist 40 Sydney Garvan 40 Peter Le Couteur 40 CNN Sara Sidner 40 Ayo Banjo 40 Gustavo Saposnik 40 Sékaly 40 Grigori Enikolopov 40 Maragakis 40 Dr. Hyon Choi 40 Yaakov Nahmias 40 Crum Cianflone 40 Kobia Methodist 40 Genetic predisposition 40 Masaru Emoto 40 Tornaes 40 prehistoric archeology 40 SIgN 40 Prof Nayernia 40 Mysorekar 40 ENT surgeon 40 epigenetic regulation 40 Amir Farid Isahak 40 Jerome Lejeune 40 van der Zwan 40 Clarren 40 Angermeyer 40 Middle Awash 40 Roberto Pili 40 Shaiko 40 ML Nath 40 Margaret Honein 40 Thomas Kodadek 40 Gordon McVie 40 Massimo Marcone 40 Magembe 39 Sarah Blaffer Hrdy 39 George Preti 39 contagious yawning 39 Raghuraman Kannan 39 Goklany