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Astronomers with access to Hubble Space Telescope data have reported finding a giant black hole in one of the smallest known galaxies.The black hole has a mass of 21 million suns - it is five times greater than the one at the center of the Milky Way - and was discovered in a dwarf galaxy known as M60-UCD1.The findings published in the scientific journal Nature suggest that dwarf galaxies may be remnants of larger ones that have been torn apart during collisions, in places of small islands of isolated stars.

Science BBC World, @bbc_ciencia18 September 2014image source, A. Delnavaz J. Voixcaption, Aidin Delnavaz tested the strap that draws power from his jaw attached to a headset.It may not be a very aesthetic accessory, but it can be useful: a strap that fits on the chin and converts the movements of the jaw into electricity.Thus, chewing could produce the energy necessary to charge small devices, for example, hearing aids.That's the brainchild of a team of engineers, who created the strap with a "smart" material that charges with electricity when stretched.According to Aidin Delnavaz and Jeremie Voix, from the Ecole de Technologie…

justin greggspecial for BBC18 September 2014image source, Thinkstockcaption, Which of the two do you think is smarter?Dolphins – sociable, playful and communicative – are widely considered the second most intelligent animals after humans.But in recent years interest in the cognitive capacity of dogs has risen and researchers from specialized centers say that many more things happen in the brain of dogs than previously thought.In some cognitive tests, they actually outperform great apes and dolphins.So what does science say? Can dogs be intellectual rivals of dolphins?understand humans"There is a lot of evidence that dogs have a better ability than primates to…

The most natural thing is smile when we are happy and cry when we are sad. But sometimes when we feel extremely happy, we end up crying with joy. Something similar happens when we are nervous. The natural thing on these occasions would be to maintain a serious demeanor but, when the nerves get worse, there are who reacts with a nervous laugh or even with a laugh. But why does this happen? Why do we have seemingly contrary reactions to our feelings? whatAre our brains short-circuiting for emotions? Pay attention because the answer, in addition to being fascinating, invites…