What are you gonna do on your first day back at school?
1) a cellphone contains chargeable batteries. These batteries carry charges which appear as voltage on the battery terminals. As the battery is used, the charges in the battery are drawn out. The charger (not really a cellphone charger but a battery charger) replenishes the charge in the battery. 2) Friction of the clothes tumbling in the dryer once the clothes are dry causes a build up of static electricity on the clothes. Some clothes will get positive charges and others will get negative charges (if the clothes started out neutral, then the negative charges will equal the positive charges). Since opposite charges attract each other, the clothes carrying opposite charges will cling together. 3) Tall buildings will attract lightning strikes because of their height above the ground. If the electricity enters the structure of the building, heat will build up and start a fire. The lightning rod attracts the lightning first (since it is higher than the building) and a direct connection from the rod to the earth carries the charge away. 4) You should lie flat on the ground. High points are attractors of lightning.
A black hole is not actually a hole - it doesn't take you anywhere. A black hole is a sphere dense object in space with an immense gravitational pull. A black holes gravitational pull is so strong that nothing, including light, can escape it - hence them being black (dark spots). Just like how when you throw a stone in the sky on Earth it will eventually fall back down to Earth, because gravity pulls it back. However with a black hole, if you shone a beam of light away from a black hole the photons (light) would be pulled back to the black hole by gravity. A black hole is formed when the core of a dense star collapses into itself. In the process of a black hole forming it also triggers the star to explode into a nova. Black holes have not actually been observed directly, however they have been observed by telescopes and satellites. We study black holes by looking at celestial objects orbiting a dark spot in space, then we use maths. Don't mistake a black hole for a celestial vacuum - many things actually orbit a black hole, like planets orbit stars. Did you know our Sun orbits a supermassive black hole in the middle of our galaxy? There are billions and billions of stars which orbit the supermassive black hole in the middle of our galaxy. It is believe in the center of every large galaxy there is a black hole - this is because it's the black hole what holds the galaxy together.
