"Mad Money" host Jim Cramer rings the lightning round bell, which means he's giving his answers to callers' stock questions at rapid speed.

So far in this series, we’ve talked about man-made byproducts — Fordite, which is built-up layers of cured car enamel, and Trinitite, which was created during the first nuclear bomb ...

Within minutes, an orange flash raced down the trunk followed by pealing thunder. Lightning usually lasts under a second. A typical lightning flash measures about 300 million volts and 30,000 amps ...