Tania Lombrozo

The killings of two journalists in Virginia last week have reignited a national conversation on mass shootings and gun control.

No one wants dangerous people with dangerous guns, but different parties point in different directions when it comes to laying the blame for gun violence or proposing appropriate policies moving forward.

According to a news feature from the journal Nature, shortsightedness could be on the rise because children are spending less time outdoors than they used to.

With the recent outbreak of measles originating from Disneyland, there's been no shortage of speculation, accusation and recrimination concerning why some people won't vaccinate their children.

Which is a better magic trick: turning a dove into a glass of milk, or a glass of milk into a dove? Turning a rose into a vase, or a vase into a rose?

For most people, the way these transformations go makes a big difference. In each case, they find the transformation from a nonliving object to a living thing more interesting — but why? Is it just more exciting to see a living thing appear than to have it vanish? Or is there something deeper at work?

Twice a year, most Americans do a truly bizarre thing. In coordinated fashion, we change our clocks an hour ahead or behind and proceed as if the new time tells us what we should be doing: when to eat, when to sleep, when to wake and when to work.

Earth, of course, spins and rotates on its merry course, unperturbed by our temporal machinations. If we used to wake after sunrise, we might now wake before morning light. If we used to drive home with the setting sun, we might now drive home in darkness.

Hardly a week goes by without some brain imaging study making the rounds in science news.

In a commentary published earlier this month in Nature, Harvard professor Sarah S. Richardson and six co-authors caution scientists, journalists and the public against drawing hasty conclusions from findings concerning epigenetic effects on human development.