This Week in Science: Enriching bread with spinach, a GPS glitch, a new Parkinson's test, and more!First up: Sneaking spinach into bread could be a good way to get more veggies in your diet, providing useful benefits for your insulin response too. Also this week:

A 'fox head' turns out to be from an extinct species

Metformin seems to be a 'wonder drug' for slowing aging

A 10-sided structure appears on Saturn

How a solar storm caused a major GPS glitch