Some monarch butterflies winter as far south as Mexico each year, and then they migrate back to the US and Canada, taking advantage of the bloom cycle along the way. Here we see the moment the butterflies embark en masse on their long journeys, some foota
A Meteorologist from the University of Reading shows just how long it takes water to soak into parched ground, illustrating why heavy rainfall after a drought can be dangerous and might lead to flash floods.
Mass of RBS 2043 -- Supermassive black hole laying at the galactical centre of the Phoenix Cluster (=20 billion solar mass)
