In case the power of a piranha's bite was ever in question, here's some video evidence to ensure that explorers think twice before wading through waters in the Ecuadorian rainforest.
In this 2011 YouTube clip, which recently surfaced on Reddit, a man demonstrates just how sharp piranhas' teeth can be by placing a stick in front of the creature. Sure enough, the piranha chomps off the edge of the stick with little to no effort.
According to the video's description, the bite test took place in the Cuyabeno Reserve in the Ecuadorian rainforest.
Equipped with strong jaws and interlocking teeth, piranhas often feast on insects and other fish, but they have been seen attacking larger animals as large as horses, according to Animal Planet. The fish, which are native to several parts of South America, can also turn to cannibalism if their food supply is limited.
However, though piranhas are known for eating meat, they rarely attack humans, National Geographic notes.
Recent research published in the Journal of Experimental Biology explained that certain piranhas emit "barking" noises to scare off other piranhas in their vicinity.
Red-bellied piranhas, which are indigenous to areas including Brazil, Ecuador and Venezuela, produce three combative sounds: the barking noise, a "drum-like percussive sound" emitted when they were fighting over food, and a "croaking" sound that they made with their jaws, according to Live Science explains.
The Father Of Radio
Italian inventor Guglielmo Marconi received U.S. patent number No. 586,193 for his wireless telegraph on July 13, 1897. Credited as the inventor of the radio, Marconi would go on to develop this into a device that would change communication forever.
Get Ready For Your Close-Up, Mars
NASA's space probe Mariner 4 sent back the very first close-up photo of Mars on July 14, 1965. Orbiting 10,500 miles from the Red Planet, the photos revealed that there were craters on Mars.
On July 10, 1908 Dutch physicist Kamerlingh Onnes (1853-1926) made a chemical breakthrough when he liquified helium by bringing it to a temperature of 4.2 K (about -269 ºC). At the time, this was the coldest temperature reached on Earth. Today, liquid helium is used as a coolant for the superconducting magnets found in MRI machines.
Hughes' Historic Flight
Famous aviator and business magnate Howard Hughes set a new record on July 10, 1938, when he flew around the world in only 91 hours. Departing from and arriving in New York City, Hughes' Lockheed Super Electra flew him right into the annals of aviation history.
The discovery of Nobelium, element 102, was announced by physicists at the Nobel Institute in Sweden on July 9, 1957. Named after Alfred Nobel, the synthesized element still remains largely mysterious to scientists.
The 'Genesis Planet' was discovered on July 10, 2003. The planet, named PSR B1620-26 b (but also nicknamed 'Methuselah') is 12,400 light-years away from Earth, located in the constellation Scorpius. Believed to be about 12.7 billion years old, it is the oldest known extrasolar planet.
On July 11, 1811, famous Italian physicist Amedeo Avogadro published seminal essays on his molecular theory of gases. Although his ideas weren't accepted by the scientific community at the time, he has been acknowledged as an important figure in physics and chemistry. You may know him as the namesake of Avogadro's number, learned in elementary chemistry classes as 6.022 x 10^23, the number of particles in 1 mole of a substance.
Skylab Ignites A Commotion
The first U.S. space station reentered Earth's atmosphere with a bang on July 11, 1979. Skylab, which had been in orbit since 1973, created an international media event when it burned (unmanned) through the atmosphere over Western Australia. Several newspapers even offered prizes to people who found falling debris.
On July 9, 1595, the German astronomer Johannes Kepler (1571-1630) published his<em> Mysterium cosmographicum</em>, or Mystery of the Cosmos. In it, Kepler described what he thought was an invisible underlying geometric structure that explained the relationships of the planets. Although his calculations were very accurate, his theory was later proven wrong.
Swedish chemist Alfred Nobel (1833-1896) demonstrated his new invention, dynamite, on July 14, 1867 at a quarry in Surrey, England. Nobel used nitroglycerin to produce an explosive that was contained and manageable. However, concerned with his posthumous reputation as the father of dangerous explosives, Nobel arranged his famous prize to be awarded to advancements in esteemed subject areas each year.