Sound has a speed limit. Under normal circumstances, its waves can travel no faster than about 36 kilometers per second, physicists propose October 9 in Science Advances.
Sound zips along at different rates in different materials — moving faster in water than in air for example. But under conditions found naturally on Earth, no material can host sound waves that outpace this ultimate limit, which is about 100 times the typical seed of sound traveling in air.
The team’s reasoning rests on well-known equations of physics and mathematical relationships. “Given the simplicity of the argument, it suggests that [the researchers] are putting their finger on something very deep,” says condensed matter physicist Kamran Behnia of École Supérieure de Physique et de Chimie Industrielles in Paris.
The equation for the speed limit rests on fundamental constants, special numbers that rule the cosmos. One such number, the speed of light, sets
Experts working in the field of vaccine development tend to believe that an effective vaccine is not likely to be available for the general public before the fall of 2021. In a paper published this week in the Journal of General Internal Medicine, a McGill-led team published the results of a recent survey of 28 experts working in vaccinology.
The survey was carried out in late June 2020. The majority of those surveyed were mostly Canadian or American academics with an average of 25 years of experience working in the field.
“Experts in our survey offered forecasts on vaccine development that were generally less optimistic than the timeline of early 2021 offered by US public officials. In general they seem to believe that a publicly available vaccine next summer is the best-case scenario with the possibility that it may take until 2022,” said Jonathan Kimmelman, a James McGill professor
Amazon’s Prime Day is finally coming. The annual sale event will be held in the US on Tuesday, Oct. 13, and Wednesday, Oct. 14, according to an internal message Amazon sent employees this week.
The message, sent Thursday, said that an official announcement from Amazon is coming Sept. 28.
CNET on Tuesday reported that Prime Day would kick off on Oct. 13, citing four people with knowledge of Amazon’s plans.
In preparation for the sale, Amazon has already blacked out vacation for its full-time warehouse workers from Oct. 13-20, according to another internal message to employees that CNET reviewed. The news fits with earlier statements from Amazon that confirmed the closely followed online event would take place in the fourth quarter.
An Amazon spokesperson on Tuesday declined to comment on the starting date. “Stay
With Zachary Brennan, David Lim and Lauraine Genota
— “We need science to be the place of trust.” What happened with the vaccine guidance.
— Trump’s importation plan is here with savings TBD.
— Science academies sound the alarm on political interference with Covid-19 vaccines.
It’s Friday, welcome back to Prescription Pulse. Happy birthday, Hatch-Waxman Act! H/t Zachary Brennan for the reminder. As always, send pharma tips and news to [email protected] or @owermohle. Loop in David Lim ([email protected] or @davidalim) and Zachary Brennan ([email protected] or @ZacharyBrennan)!
WHAT HAPPENED WITH THE VACCINE GUIDANCE? FDA Commissioner Stephen Hahn spent weeks preparing a proposal to set morestringent standards for emergency authorization