- Hippopotamuses have skin 3.8cm (1.5in) thick.
- It takes a plastic container over 50,000 years to start decomposing.
- Trees do not have life expectancies (most can grown indefinitely).
- The world's knowledge is growing so fast that 90% of what we will know in 50 years time will be discovered in those 50 years.
- An elephant's trunk can hold over 5 litres of water.
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