It was okay for a set of footprints to prove that mankind arrived in the Americas 40,000 years ago instead of just 10,000. But now that argon dating reveals the rocks are 1.3 million years old, orthodox scientists have determined that they aren't human footprints after all (because they couldn't be, could they?).

The article does not offer up any alternative ownwer of the footprints.

Source: New Scientist

Doctors treating a woman at risk of having a premature baby may inadvertently be affecting her future grandchildren as well. A study in guinea pigs suggests that a drug commonly given to pregnant women to help their babies mature enough to survive can also affect the brains and behaviour of their grandchildren too. The finding raises a difficult dilemma for doctors, for while the drug undoubtedly saves lives, its side effects could last for generations.

Source: New Scientist