National Geographic Animals on Instagram: "Bear necessities: magical meadows and salmon spreads 🍣 Follow this mama brown bear and her cub through the gorgeous Alaskan wilderness of Lake Clark National Park, as they bulk up before their next hibernation 💪🐻"

vt.physics on Instagram: "Why Don't Surgery Lights Make Shadows? Surgical lights are designed to minimize or eliminate shadows to ensure a clear, consistent view of the surgical site. This is achieved through several features. Firstly, they use multiple light sources arranged in a circular or multi-headed pattern, so if one beam is blocked by a surgeon’s hand or instrument, light from another angle fills in the shadow. Secondly, they produce a highly focused, parallel, and bright beam, which red