2. Hummingbirds consume half of their body weight in food every day.
3. Traffic lights with red and green gas lights were first introduced in
London in 1868.
4. 3 billion of the world's 6 billion population are under the age of 25.
5. Infant mortality in 1900 was 142 in 1000 births. By 2000 it had reduced
to just 6 in every 1000.
6. The call of the humpback whale is louder than Concorde and can be heard
from 500 miles away.
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