BRAIN DUMP

SCIENCE

Can you boost your immune system?

Con Bruce

■ There are lots of ways to strengthen your immune response that are supported by science. Eating a diet high in fruit and vegetables and maintaining a healthy weight are vitally important to the immune system. Get enough sleep and exercise regularly. Don’t smoke and keep your alcohol intake at a minimum. There are countless products available  that claim to be immune boosters. We’re still in the dark about which specific microbes are most helpful and how many of each we should have. The body already makes more immune cells than it can use. Medication designed to increase cell production may not be helpful in the long run, as excess cells simply self-destruct after a short time. AG

TRANSPORT

Why can’t helicopters fly up Everest?

Xie Wen

■ The forward flight of a helicopter is generally limited by the engine’s ability to breathe