70 per cent of people live in countries without sustainable resources newscientist.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from newscientist.com Daily Mail and Mail on Sunday newspapers.
REUTERS
Black people are more likely than white people to have their mental health affected by strings of highly publicised US police killings of Black people, according to the first nationwide scientific assessment of these media reports
Police violence against Black people in the US often leads to extensive media coverage. David Curtis at the University of Utah and his colleagues wanted to understand how the mental health of Black individuals was affected after such events.
Advertisement
The team combined a database of US police killings with Google Trends data to identify 47 high-profile incidents of police killing Black individuals or subsequent legal decisions that occurred between 2013 and 2017, including the killing of Michael Brown. These comprised the reporting of 38 police killings of Black individuals, and coverage of about nine legal decisions not to convict officers involved in some of those killings. The team also looked at the reporting of two convicted murderers
T. rexes walked the Earth during its existence, reports Karina Shah for
New Scientist. The new study was published this week in the journal
Charles R. Marshall, a University of California, Berkeley paleontologist, was fascinated with the idea of how many of the mega-predators walked the Earth whenever he held a
T. rex fossil, reports the
New York Times.
“Were there are a million, a billion, a trillion
T. rexes? Is this one in a million, one in a billion, one in a trillion? How on earth could we know that number? We all know fossils are rare, but how rare are they? And so it really started with that question,” Marshall tells the
ROGER HARRIS/Science Photo Libra
A total of 2.5 billion
Tyrannosaurus rex probably existed during the lifespan of the species, researchers have calculated – suggesting that very few survived as fossils.
Charles Marshall at the University of California, Berkeley, and his colleagues used body mass and population density to estimate how many
T. rex once lived.
Advertisement
Larger animals tend to have a larger individual range, because they need more food to support their body mass than smaller animals, meaning body mass is inversely correlated with population density – a rule known as Damuth’s law.
Previous analysis of
T. rex fossils shows that the average body mass of an adult was about 5200 kilograms. The team also used climate models and the locations of
Tim Gainey/Alamy
People expect chocolate to taste more bitter if it is in black packaging, while yellow and pink packaging is associated with sweeter-tasting chocolate.
Iuri Baptista at the University of Campinas in Brazil and his colleagues wanted to investigate how people respond to the colour of chocolate packaging.
The researchers sent a survey to 420 people between the ages of 18 and 60. Half of the participants were in Brazil and the other half were in France. The survey contained two photos of milk chocolate bars … Continue reading Subscribe now for unlimited access
App + Web