Dinosaur-killing asteroid strike gave rise to Amazon rainforest. How Sonar Works (Submarine Shadow Zone) - Smarter Every Day 249. UK fusion experiment used in hunt for clean energy. What maths is involved in stirring a cup of tea? Shark researchers size up real 'Megalodon' for first time. Image copyright Oliver Demuth The enormity of a prehistoric mega-shark made famous in Hollywood films has finally been revealed by researchers.
Until now, only the length of the Otodus Megalodon, as featured in the 2018 film The Meg, had been estimated from fossils of its teeth. However a team from Swansea and Bristol universities have combined maths with nature to reveal just how big it was. The study has been published in the journal Scientific Reports. Researchers used mathematical methods and comparisons with living relatives to find the overall size of the megalodon, which lived from about 23 million to three million years ago. Image copyright Swansea University Results suggest a 16m (52ft) megalodon - almost three times as long as a great white shark - is likely to have had a head about 4.65m (15ft) long, a dorsal fin as large as an entire adult human and a tail about 3.85m (13ft) high. "However the dimensions in the film were actually pretty accurate.
" Image copyright Jack Cooper. BBC Science Focus Magazine - science, nature, technology, Q&As. What Is History's Greatest Mystery? Read Historians' Nominations & Cast Your Vote! - HistoryExtra. Already read the feature in our June issue?
Cast your vote in our poll* now, or read on to find out more about history’s greatest mysteries… *open until 10 June 2020 Who built Stonehenge – and why? Chosen by Mike Pitts When the crowds have gone and jackdaws strut high above on the megalithic lintels, I can bask in the quiet majesty of Stonehenge. We build our picture of the ancient past from things we dig up and things we imagine. Historical inquiry, finding no record of Stonehenge’s construction, sought to pin the achievement on known ancient peoples from other countries: Greeks, Romans and early medieval Danes. Historical inquiry, finding no record of Stonehenge’s construction, sought to pin the achievement on known ancient peoples from other countries. The surprising psychology behind mastering a new skill - BBC Reel. What year is it? And 'Lo!' - How the internet was born. Image copyright Getty Images In the 1960s, Bob Taylor worked at the heart of the Pentagon in Washington DC.
He was on the third floor, near the US defence secretary and the boss of the Advanced Research Projects Agency (Arpa). Nobel chemistry prize: Lithium-ion battery scientists honoured. Image copyright U TEXAS / BINGHAMTON / AFP Three scientists have been awarded the 2019 Nobel Prize in Chemistry for the development of lithium-ion batteries.
John B Goodenough, M Stanley Whittingham and Akira Yoshino share the prize for their work on these rechargeable devices, which are used for portable electronics. At the age of 97, Prof Goodenough is the oldest ever Nobel laureate. Professor of chemistry Olof Ramström said lithium-ion batteries had "enabled the mobile world". Categories of hurricane: Here's what hurricane ratings mean. States bracing for monster Hurricane Dorian Hurricane Dorian intensified over the weekend into one of the strongest Atlantic hurricanes ever recorded.
Hurricanes are rated on the Saffir-Simpson Hurricane Wind Scale, which includes five categories based on the storm's sustained wind speeds. It also estimates possible damage to property, ranging from "some damage" to "catastrophic. " If a storm is a Category 3, 4 or 5, it is deemed a "major" hurricane due to the potential for "significant loss of life and damage," the National Hurricane Center says.
Hurricanes that fall into categories 1 or 2 are still considered dangerous, the center says. Algorithms: The story of how they got their name - BBC Ideas. El Salvador: ¿Por qué mi municipio se llama así? A lo largo y ancho de El Salvador, encontramos nombres de municipios difíciles de pronunciar cuya definición no se encuentra de manera inmediata en el castellano.
Éstas, en principio, son poblaciones con nombres indígenas, pero no son las únicas. En El Salvador existen cinco grandes bloques en lo que pueden clasificarse los municipios según su nombre: 1. Municipios con toponimia de orígenes indígenas. 2. Municipios con nombre de santo o advocación católica y/o con toponimia indígena. 3. Municipios con nombres de otras ciudades o países 4. Municipios con nombre indígenas Dentro de este grupo existen a su vez cuatro tipos de municipios con nombres indígenas, puesto que fueron cuatro grandes poblaciones indígenas que se asentaron en el actual territorio: la náhuat-pipil en el occidente, centro y zona paracentral del país; la lenca, en la zona norte y oriente; la ulúa en partes de San Miguel, La Unión y Morazán; y la maya, en Chalatenango. Scientists 'speechless' at Arctic fox's epic trek. Image copyright Universal Images Group/Getty Images A young Arctic fox has walked across the ice from Norway's Svalbard islands to northern Canada in an epic journey, covering 3,506 km (2,176 miles) in 76 days.
"The fox's journey has left scientists speechless," according to Greenland's Sermitsiaq newspaper. Researchers at Norway's Polar Institute fitted the young female with a GPS tracking device and freed her into the wild in late March last year on the east coast of Spitsbergen, the Svalbard archipelago's main island. The fox was under a year old when she set off west in search of food, reaching Greenland just 21 days later - a journey of 1,512 km - before trudging forward on the second leg of her trek.
Tower Crane Assembly with Climber Demo.