When you squint, it is mainly the muscles around the eyelids that come into play, especially the orbicularis oculi muscle. This circular muscle contracts gently...
The way a mirror distorts an image essentially depends on its shape and its curvature. A normal mirror, the one you use every day, is...
The foam you see in your bath is mainly due to the presence of surfactants, molecules found in soap and shower gels. These somewhat special...
Tides occur mainly due to the gravitational force exerted by the Moon, and to a lesser extent by the Sun, on the Earth's oceans. As...
Cloud forests are humid tropical forests located at high altitudes on mountains, almost constantly shrouded in thick mist or low clouds. This frequent condensation creates...
Water is simply composed of pure water molecules (H₂O), while soda is a much more complex liquid: it mainly contains water, but also sugars, carbon...
Stars emit X-rays when their heated material reaches very high temperatures, typically several million degrees. At these temperatures, electrons are stripped from atoms: the gas...
Iceland is located right on the border between two major tectonic plates: the North American plate and the Eurasian plate. These plates slowly drift apart...
Most volcanoes on Earth are located near the edges where large tectonic plates collide, pull apart, or overlap. This area where volcanism is concentrated forms...
In deserts, the intense heat leads to the rapid evaporation of water present on the surface or just below the ground. When this water evaporates, it leaves...
