Healthcare

Scientists uncover key to future hepatitis C vaccine
Newly discovered gut bacteria may be a culprit behind rheumatoid arthritis
Brain implant translates neural activity into letters, letting a paralyzed man “speak”
Doctors may not be ready for blood tests that screen for multiple cancers at once
“Laughing gas” may offer quick, long-lasting relief from depression
Organ regeneration could overcome liver failure, without a transplant
AI could help cancer patients avoid a deadly recurrence
New exercise study could find drugs that mimic working out 
These earbuds can tell if a newborn has hearing problems
To avoid the worst effects of aging, we might need to exercise harder than we thought