A single lightning bolt has enough energy to toast 100,000 slices of bread.
Why it is true
A typical lightning bolt carries about 1 billion joules of energy. That energy would be enough to toast about 100,000 slices of bread or to power a 100-watt lamp for more than three months.
Source: NOAA
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.