Medicine: Ultrasound waves are more than loud enough to rouse a sleeping fetus.
By Gunjan Sinha
Posted 01.31.2002 at 4:54 pm 0 Comments
Nothing thrills expectant parents like an ultrasound vision of their developing fetus. But Mostafa Fatemi of Minnesota's Mayo Clinic wondered why such fetuses always seem to move and stretch while their picture is taken. He found out by placing a tiny hydrophone inside a woman's uterus during the procedure. The device registered up to nearly 100 decibels -- as loud as a subway train.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.