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.
Posted 5 years ago by SandraN in category: science   Comments (0)

Michael S. Schneider explains how the Ancient Egyptians (and Chinese) and modern computers multiply and divide
Posted 8 years ago by boyt in category: interesting   Comments (1)

Moving parts of the engine
Posted 12 years ago by boyt in category: commercials   Comments (0)

The song that spent the most weeks at #1 on the US Billboard chart for each year.
Posted 1 year ago by PennY in category: music   Comments (0)