Picture a brand-new, unsharpened pencil. The graphite at its core can't be used for writing until a pencil sharpener chews away its wooden tip.
It is impossible to see when the "lead" in a pencil cracks within the pencil, but an acoustic sensor can "hear" the change in the way the pencil vibrates. Now, researchers in China have reported in the International Journal ...
If you've ever sat opposite a doctor and wondered what she was scribbling on her notepad, the answer may soon not only be medical notes on your condition, but real-time chemical preparations for an instant diagnostic test.
(Phys.org) —Sometimes solving a problem doesn't require a high-tech solution. Sometimes, you have to look no farther than your desktop.