An asteroid ‘the size of 33 armadillos’ might be a flight of fancy, but real astronomers measure celestial objects with units that are just as strange.
A new standard defines the kilogram from today.
Shutterstock/Piotr Wytrazek
Today marks one of the biggest shake-ups in the history of measurement. But the new standards on how we define units of mass, length, time and so on are not easy to explain.
A solar water heating unit on the roof of a home in Kuyasa outside Cape Town. South Africa has a long way to go to get people off the grid and onto solar heating.
Epa/Nic Bothma
Wilfred Fritz, Cape Peninsula University of Technology e Deon Kallis, Cape Peninsula University of Technology
Africa is blessed with an abundance of sunshine.Given the heavy demand for energy, alternatives, such as solar, could provide solutions and help stimulate economic growth.