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Teeth help scientists trace evolution of great white shark family to Middle Jurassic

Teeth help scientists trace evolution of great white shark family to Middle Jurassic

Science
July 5 (UPI) -- By surveying the composition of great white shark teeth, researchers were able to trace the evolutionary origins of the mackerel shark family, Lamniformes, to a small benthic shark from the Middle Jurassic. In addition to the great white, the Lamniformes family features the biggest shark in history, Megalodon, as well as the fastest modern shark, the mako shark. But according to a new study -- published this week in the journal Scientific Reports -- the group's oldest ancestor was a small bottom feeder that lived 165 million years ago. Scientists were able to track the family's evolutionary origins after discovering a unique characteristic of great white shark teeth. Shark teeth feature a hard shell composed of a hypermineralized tissue called enameloid, like enamel in hu...
Boys more likely to need help for ‘back to school asthma’

Boys more likely to need help for ‘back to school asthma’

Health
Boys with asthma are twice as likely as girls to visit their GP with worsening symptoms during the first weeks of the new school year, research suggests. It found a tripling of appointments related to "back to school" asthma in England.Being exposed to new viruses at school and a relaxed use of inhalers over the holidays could be factors, experts say.Asthma could turn into "a ticking time bomb" during the summer holidays, Asthma UK said.In recent years, there has been a sharp rise in school-age children with asthma being admitted to hospital in September, around the start of the autumn term.These increases, called the "back to school" effect, were also found in Scotland and Wales."Back to school asthma" is thought to account for up to a quarter of serious...
California is the latest state to help millions of workers join retirement savings plans

California is the latest state to help millions of workers join retirement savings plans

Finance
An estimated 7.5 million California workers soon will have access to workplace retirement savings.That's due to CalSavers, the Golden State's automatic individual retirement account enrollment plan, which officially begins on Monday. The program was established after the state required employers with five or more employees to either join CalSavers or begin offering a private plan.Over the next several years, employers will face rolling deadlines to register with CalSavers in order to comply. The first is for businesses with more than 100 employees, which have a deadline of June 30, 2020. The deadline for entities with five or more employees is June 30, 2022.The truth is, you may or may not need to replace all of your current income to retire early.ImageegamI | Getty ImagesBut all businesse...
‘Friendly’ bacteria could help save frogs from disease

‘Friendly’ bacteria could help save frogs from disease

Science
Bacteria living on the skin of frogs could protect them against a deadly virus, according to research.The work by scientists at the University of Exeter and Zoological Society of London could help save species such as the European common frog from being wiped out by a disease.Amphibians have been hit particularly hard by changes in the natural world.Up to 40% of species are close to dying out due to factors such as pathogens, habitat loss and climate change.The British scientists looked at how common frogs are coping with ranavirus, which can kill a large number of frogs in a short time in UK ponds. They found a link between outbreaks of the disease and the make-up of bacteria on the frogs' skin...