Organs often have fluid-filled spaces called lumens, which are crucial for organ function and serve as transport and delivery ...

Galaxy clusters are formed by a dense packing of many galaxies, making them the most massive structures in the universe.

As far as taking care of my body goes, I'm not exactly low maintenance. I regularly lift weights and try to get in pilates when I can, and I aim to eat a balanced diet. But in spite of this, I still ...