To fuse, two protons must overcome their electrical repulsion. By classical physics, the 15-million-degree core of the Sun isn't hot enough. It shines thanks to quantum tunnelling, which lets a particle occasionally slip through a barrier it lacks the energy to climb. Daylight is a quantum effect on a gigantic scale.
A large share of Earth's water molecules formed in the interstellar cloud that existed before the Sun was even born, more than 4.6 billion years ago. You are literally drinking a cosmic fossil.
By day, the Martian sky looks butterscotch because of fine dust hanging in the air. But at dusk, those same grains scatter blue light forward, creating a bluish glow around the Sun. Rovers have photographed these blue sunsets: the exact reverse of what we see on Earth.