Herez one:
NASA decided to try an experiment on birds living in space to see if they behaved differently. They set up everything, supplied the 3 birds with food, oxygen, water to last for a month. They send the rocket containing everything into space. The birds survive the travel and NASA begins the experiment. However, the birds die within 2 hours of arriving in space. How did the birds die?

Anorher fairly simple one:
A scientist studying in Antarctica comes upon a body frozen in the ice. He runs back to camp and tells everybody else that he has found Adam, (as in the Adam) but he did not do anything to the ice or body. How does the scientist know that this is Adam?