The market is growing for marine collagen, which is promoted for joint health and youthful skin. But with overfishing and climate change already threatening global ocean wildlife, is this a sustainable place to turn for anti-aging hope?

In the U.K., where the debate over transgender care has become increasingly heated, England's National Health Service has banned puberty blockers for youth following a review it commissioned, which found a lack of evidence that the medications help with gender dysphoria. Canadian doctors who spoke to CBC News disagree.

In a new study tracking the lives of polar bears near Churchill, Man., researchers aimed to find out what they live on during the summer. Some conserved energy while others scrambled for food, but nearly all lost weight raising concerns about starvation risks in the future as sea ice declines.