HealthWe’ve discovered a whole new defence system against germs in our noses Billions of tiny sacs filled with weapons and warning signals to other cells are released into the lining of our noses when dangerous bacteria are detected News
EnvironmentRock layers show our sun has been in same cycle for 700 million years Our star gets more and less active in a repeating cycle that lasts 11 years, and ancient rocks suggest it behaved the same way over 700 million years ago News