Have a science question on a public policy issue? Ask us.
Q: Did a recent study in Denmark show that face masks are useless for COVID-19?
A: No. The study found that face masks did not have a large protective effect for wearers — not that masks provide no protection at all or don’t offer benefits to others.
Q: Does vitamin D help protect against COVID-19?
A: Some scientists have hypothesized vitamin D might be helpful, but there is no direct evidence that vitamin D can prevent COVID-19 or lessen disease severity. Nevertheless, it should be part of a healthy lifestyle.
Q: Does ibuprofen make COVID-19 worse?
A: There is no evidence that ibuprofen or other non-steroidal anti-inflammatory drugs can make COVID-19 cases more severe. You should consult your doctor before changing medications.
Q. Is it true that federal agents arrested Harvard professor Charles Lieber for creating the coronavirus?
A: No. Lieber, a nanoscientist, was charged for lying about his participation in a Chinese recruitment program and his affiliation with a Chinese university. He is not accused of being a spy and has no connection to the new coronavirus.
Q: Do people with serious mental health disorders pose a greater risk of becoming mass shooters?
A: People with mental illnesses are somewhat more likely to be violent than those without a diagnosis. But a majority are never violent, and very little is known specifically about mass murder.
Q: Does the Amazon produce 20% of the world’s oxygen?
A: No. Scientists estimate the percentage is closer to 6 to 9%, and the Amazon ultimately consumes nearly all of that oxygen itself.
Q: When is the human heart fully developed, and when are heartbeats audible during pregnancy?
A: A developing heart has all of its primary structures after about nine weeks of pregnancy. Some forms of ultrasound can detect cardiac activity in an embryo in the sixth week, but a heartbeat wouldn’t be audible until about 10 weeks on a Doppler fetal monitor.
Q. Did the Environmental Protection Agency change its rules to allow companies to use asbestos in manufacturing?
A. No. Asbestos is already allowed in numerous products. A proposed EPA rule would prohibit the use of asbestos in certain products unless granted EPA approval.
Q: Did people develop cancer because of the polio vaccine?
A: There are no known cases, and it’s very unlikely. In the 1950s and 1960s, people did receive polio vaccines contaminated with a virus that causes cancer in rodents. But research suggests this virus doesn’t cause cancer in humans.
Q: Does the National Institutes of Health fund research on human-animal chimeras, or organisms that are part-human, part-other animal?
A: With some exceptions, the NIH doesn’t fund research on human-animal chimeras. But the agency has proposed a rule to widen the scope of research it funds in this area.