A simple method to test any alkaline battery in seconds.
For a brighter and cleaner future
A team of six µTug microrobots weighing 100 grams pulling the author's unmodified 3900lb (1800kg) car on polished concrete.
Scientists shot a long copper wire into a lightning-prone cloud using a small rocket. The generated lightning followed the wire down to the ground, allowing the researchers to record the sound waves of the resulting thunder. The green flashes are caused by the intense heating of the copper wire.
