Most wild almonds are really poisonous and “eating even a few dozens in one sitting can be fatal” and that how we bred safe ones remains a mystery.
27. In 1947, a British South American Airways flight was flying normally over the Andes Mountains, but 4 minutes from landing, it sent a morse code message 'STENDEC' three consecutive times. The plane then vanished and the wreckage was not found for over 50 years. To this day, what 'STENDEC' meant is a mystery.
28. It is a mystery why so many birds and dinosaur fossils exhibit a 'death pose' - the characteristic posture consisting of head thrown back, tail extended, and mouth wide open.
29. The Shell Grotto is a mysterious underground chamber discovered in a back garden in the South East of England during the Victorian era. Buried a few feet underground, it was excavated and found to contain myriad religious symbols from around the world. Its origins remain a mystery.
30. There is 9.3 miles by 17.4 miles geoglyph (Marree Man) in Australia with 100 feet wide outlines depicting an indigenous man. Its origin remains a mystery with no known witnesses to its creation. A plaque of an American flag was found buried 5 feet under the nose of the figure.