Choppy waters

Careful with that rubber duck: you might trigger a call to the paramedics.
The National Institute of Longevity Sciences in Japan says a laser embedded in
the ceiling of your bathroom could raise the alarm if you have a seizure or fall
in the bath. By bouncing a light beam off the water, a team led by Kazuki
Nakajima detected waves produced in the water by respiration and heart rate.
“The system could detect if you stop breathing and raise the alarm,” he says.
Not everyone is impressed: “This probably isn’t the way you’d do it,” says Dave
Delpy of University College Dublin. “It sounds like overkill.”