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...work this out you just need to add in the extra distance from the Earth’s surface to the ISS (rEarth+ISS), remembering that this is 400 km. You should now convert this to metres as follows. 400 km = 400 000 metres = 4 × 105 m. So, rEarth+ISS = (6.37 × 106 m) + (4 × 105 m) = 6.77 × 106 m. Equation 7 is now adapted to Equation 9 to take this extra distance into...

...social injustices. In practice, few energy sources come close to these ideals, but renewable energy sources are generally more sustainable than fossil or nuclear fuels: they are essentially inexhaustible, and their use usually involves fewer health hazards and much lower emissions of greenhouse gases and other pollutants. So, where do renewable energies come from, and why...

...work, with “nothing less than a global New Deal for a digital world,” as called for by Ben Ramalingam of IDS? Certainly the day was filled with calls for visionary thinking: “This is an opportunity to reimagine how economies are structured and we should not lose out on that opportunity,” said Anne Jellema, CEO of the Web Foundation. Beximco has flourished partly...