Todas as espectacularidades da Internet, estranhas ou não, exceptuando a pornografia em geral (pun)
quarta-feira, 31 de janeiro de 2018
Dinossauros no Egipto (Cretáceo)
Como a África foi feita
Mas não essa África:
https://www.theguardian.com/culture/2018/jan/30/toto-how-we-made-africa
Maior onda de sempre?
Maior onda de sempre? Nazaré:
https%3A%2F%2Fwww.wavelengthmag.com%2Fnazare-big-gets%2F#pt0-518266
terça-feira, 23 de janeiro de 2018
Redes neuronais e UC?
https://www.comunidadeculturaearte.com/investigadores-da-universidade-de-coimbra-criam-algoritmo-para-a-evolucao-das-redes-neuronais-profundas/
Citando:
"Para se perceber melhor a diferença, os cientistas recorrem a uma analogia. «O que a maioria faz é afinar um Bugatti Veyron, um automóvel que, como sabemos, já é bastante rápido, de forma a conseguir boas performances; o que nós fazemos é dar ao algoritmo um conjunto de peças (jantes, pneus, peças para o motor, travões, etc.) e deixar que o algoritmo entenda o contexto da situação, isto é, descubra como combinar aquelas peças de forma a construir um veículo que obtenha uma performance competitiva. Mas nem sequer o informamos que tem de ser um carro», ilustram."
domingo, 21 de janeiro de 2018
2018-01: Exames de ADN em múmias com 4000 anos
terça-feira, 9 de janeiro de 2018
Fundo do mar afunda?
https://www.express.co.uk/news/science/902001/Ocean-floors-shrinking-under-weight-melting-glaciers-Geophysical-Research-letters-Delft
Citando:
"The report states: “Over 1993-2014, the resulting globally averaged geocentric sea level change is eight per cent smaller than the barystatic contribution. Over the altimetry domain, the difference is about five per cent, and due to this effect, barystatic sea level rise will be underestimated by more than 0.1mm/yr over 1993-2014.”
According to the research, previous estimates of sea level rising in the Arctic Ocean have been inaccurate by a millimetre each year.
The discrepancy happened because there is such a huge difference between geocentric sea level and barystatic sea levels.
Geocentric sea levels are sea level as measured from the centre of the Earth and barystatic sea level is the mass of water in the sea. "
segunda-feira, 8 de janeiro de 2018
Why no one has died in a commercial passenger jet crash in more than a year | Popular Science
Citando:
"While flying by commercial passenger jet was fatality-free globally, the industry did suffer minimal losses. By one count, from the Aviation Safety Network, there were ten accidents involving commercial passenger or cargo airplanes, claiming 44 lives in 2017. (That organization focuses on crashes involving commercial planes, cargo or passenger, meant to carry 14 or more people; it didn’t include the 35 lives lost on the ground during a cargo plane accident in Kyrgyzstan.) By another count, from a Dutch firm called To70, 14 people were killed in aviation accidents in 2017. They focused just on commercial passenger planes heavier than 12,566 pounds at takeoff.
And it’s been a record-breaking 400-plus days since the last commercial passenger jet crash anywhere in the world, according to the Aviation Safety Network’s CEO, Harro Ranter."
Curiosidades científicas: Se estamos mais perto do sol no inverno porque é que está mais frio?
We’re three million miles closer to the sun in January than we are in July. So why isn't it hot? | Popular Science
domingo, 7 de janeiro de 2018
Ray Thomas (Moody Blues)
sexta-feira, 5 de janeiro de 2018
Native Americans
http%3A%2F%2Fwww.bbc.co.uk%2Fnews%2Fscience-environment-42555577
Citando:
"The 11,500-year-old remains of an infant girl from Alaska have shed new light on the peopling of the Americas.
Genetic analysis of the child, allied to other data, indicates she belonged to a previously unknown, ancient group.
Scientists say what they have learnt from her DNA strongly supports the idea that a single wave of migrants moved into the continent from Siberia just over 20,000 years ago.
Lower sea-levels back then would have created dry land in the Bering Strait.
It would have submerged again only as northern ice sheets melted and retreated.
The pioneering settlers became the ancestors of all today's Native Americans, say Prof Eske Willerslev and colleagues. His team has published its genetics assessment in the journal Nature."
quarta-feira, 3 de janeiro de 2018
A terra e a lua a uma distância... considerável
"The OSIRIS-Rex spacecraft is expected to reach its asteroid destination, Bennu, in August 2018