結果 : why do humans yawn

-
2:31

Why Do We Yawn?

AsapSCIENCE
4,517,818 回視聴 - 11 年前
2:46

Why Do We Yawn?

SciShow
452,169 回視聴 - 10 年前
3:35

Why Do We Yawn?

Because Science
62,926 回視聴 - 4 年前
0:29

Why Do We Yawn? 😮 (EXPLAINED)

Zack D. Films
3,939,376 回視聴 - 2 年前
7:45

Why We Yawn

I CARE FOR YOUR BRAIN with DR. SULLIVAN
4,508 回視聴 - 1 年前
1:08

Why is yawning contagious? Your yawn reflex, explained. | JUST CURIOUS

USA TODAY
10,975 回視聴 - 1 年前
4:29

Why is yawning contagious? - Claudia Aguirre

TED-Ed
2,401,616 回視聴 - 11 年前
0:46

Why Do We Yawn and Is It Contagious? #shortsfeed #trending #viralshorts

Infinite Intel
424 回視聴 - 2 日前
5:45

Why Is Yawning Contagious?

Vsauce
4,731,569 回視聴 - 12 年前
0:23

Why Do We Yawn When We See Others Yawn 🤔 #short #yawn - Creativelearning3d

Creative Learning
138,599 回視聴 - 1 か月前
0:34

Why is Yawning Contagious? #shorts

Dr. Janine Bowring, ND
28,771 回視聴 - 1 年前
4:58

Why do we yawn?

Mystery Science
415,381 回視聴 - 5 年前
5:16

Why Do We Yawn? | The Dr. Binocs Show | Best Learning Videos For Kids | Peekaboo Kidz

Peekaboo Kidz
959,715 回視聴 - 6 年前
3:16

Why Do We Yawn?

Seeker
87,271 回視聴 - 11 年前
5:58

What Causes You To Yawn And Why It Is Contagious? | BYJU'S Fun Facts

BYJU'S
451,057 回視聴 - 3 年前
2:16

Learn Why We Yawn | Human Body Songs For Kids | KLT Anatomy

KLT Anatomy
307,351 回視聴 - 1 年前
0:58

Why is yawning contagious? | #aumsum #kids #science #education #children

It's AumSum Time
156,842 回視聴 - 7 年前
1:06

Why do we yawn? | #aumsum #kids #science #education #children

It's AumSum Time
168,356 回視聴 - 7 年前
0:23

It is IMPOSSIBLE not to YAWN at this video 😳🥱

Sambucha
449,990 回視聴 - 3 年前
2:24

What Is Excessive Yawning? – Dr. Berg

Dr. Eric Berg DC
121,027 回視聴 - 7 年前