Why? Tell Me Why!: Blood

Why? Tell Me Why!: Blood Why are your veins blue and blood red? This week we find out on Why? Tell Me Why!

Why? Tell Me Why!: Blood Types Discovery-News.com: Humans have four different blood types - have you ever wondered why that's the case? This week Kasey-Dee Gardner finds out. Check out more science news stories at www.discovery-news.com

Why? Tell Me Why!: Allergies dsc.discovery.com This week Kasey-Dee Gardner finds out why some people have allergies to certain foods or factors in the environment.

Why? Tell Me Why!: Laughter They say laughter is the best medicine. Kasey-Dee Gardner finds out it that's true.

Why? Tell Me Why! Pangea Did you know the world used to be one big super-continent? Kasey-Dee Gardner finds out why it pulled apart.

Why? Tell Me Why! Spam Isn't it frustrating when you open your email and it is filled with spam. Kasey-Dee Gardner finds out why spammers do what they do.

Why? Tell Me Why! Hunger Why do we get hungry during certain times of the day? Kasey-Dee Gardner finds out.

Why? Tell Me Why!: Hiccups Hiccups are the most frustrating phenomenon. Why do we get them and why are they so difficult to get rid of?

Why? Tell Me Why! Thirst Need to quench your thirst? Find out why this happens?

Why? Tell Me Why! Cockroaches Cockroaches are one of the most resilient creatures on this Earth. Find out why they are so hard to exterminate.