We have never seen dark matter and dark energy. Why do we think they exist?

Social isolation and loss of energy: Study finds a drop in energetic arousal after social isolation for people who lived alone or reported high sociability. This suggests lowered energy could be part of a homeostatic response to the lack of social contact.

IceCube Detects High-Energy Neutrino Emission from Milky Way’s Galactic Plane

NASA’s Roman and ESA’s Euclid Will Team Up To Investigate Dark Energy