Karnyalimenya School letterhead


Dear Dr Claire

I heard on the TV that Harry Houdini once held his breath for 4 minutes and 35 seconds. Is that possible? How long can most people hold their breath for? Is is safe to test this? I know some people who squat down, breathe right out, and then stand up as fast as they can. They sometimes faint. Is that dangerous?

Yours sincerely (as usual)