When you swat an insect, do you see a fountain of red blood smeared on your hand? Not unless you've killed a full mosquito. Bug goo is generally green-blue, and that can tell us something about why fictional species might have green blood.
Any time someone breaks a record, people inevitably bring up the possibility that they had some illegal enhancements. Just yesterday, gold medalist Ye Shiwen was accused of "blood doping" to improve her performance. You may be familiar with steroids and other drugs — but what on Earth is "blood doping?" And why would…
Heart and brain surgeries are called "hypothermia-dependent" procedures because doctors often have to lower their patients' temperatures during surgery. The thing is, human blood doesn't transport oxygen as well at cold temperatures. Surgeons rely on synthetic blood substitutes to help the patient's body cope.