Discovery, at Palomar Telescope (San Diego, CA, USA), of the closest (type 1) supernova found in the past 25 years. It is “only” 21 million light-years away, in the Pinwheel Galaxy.
To locate it, take the last two stars in the handle of the “big dipper” formed by the Ursa Major constellation, and form an equilateral triangle heading North. You should be able to see it by Friday night.
In a city such as New York alone, there are more than 10 billion distinct products or services being traded.
How such a complex system can work? The story of the Universe in 17 minutes, to understand how complex systems appear, from Big Bang to global social networks.