The story of PayPal, a Silicon Valley startup with a few scruffy tech-heads at the helm. It is now one of the most successful and ubiquitous companies in the world, whose alumni aren't doing... read more
Johann Doppelmayr published his Atlas Coelestis in 1742: here it is again, with all its plates and notes, with an excellent explanatory text. Comets, planets, moons, stars - this is a wonder... read more