That earthy scent after a shower was named 'petrichor' in 1964 in the journal Nature. It blends plant oils stored in the soil with geosmin, a molecule made by soil bacteria that your nose can detect at tiny concentrations. In 2015, MIT researchers filmed how it happens: raindrops hitting porous ground release tiny bubbles that fling these scents into the air.
On 27 August 1883, the eruption of the Indonesian volcano Krakatoa was heard as far away as Rodrigues Island, nearly 4,800 km away. Its pressure wave was picked up by barometers worldwide and circled the globe several times. The tsunamis that followed killed more than 36,000 people.
The deepest known point in the ocean, Challenger Deep, lies roughly 10,900 m below the Pacific surface. Drop Everest in and its summit would still sit about 2 km underwater. Down there, the pressure is more than 1,000 times what you feel at sea level, roughly a tonne pressing on every square centimetre.