Dreaming of Mars, part 2
When the Mariner 9 space probe entered into its orbit around Mars in November 1971, it was met with cheers from the control centre in California, in the US. The probe had been…
Who invented the toothbrush?
Dental hygiene is an ancient concept. Early forms of the toothbrush are mentioned as early as 3000 BC, when Egyptians and Babylonians used “˜chew sticks’ which were thin twigs with frayed edges used…
