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​​How does a Cellphone Vibrate?

Among the many components inside the phone is a small motor.
The motor is built in such a way that it is partially off-balanced.In other words, a mass of improper weight distribution is attached to the motor's shaft/axis. So when the motor rotates, the irregular weight causes the phone to vibrate.
Rotating unbalance is the uneven distribution of mass around an axis of rotation. A rotating mass, or rotor, is said to be out of balance when its center of mass (inertia axis) is out of alignment with the center of rotation (geometric axis). Unbalance causes a moment which gives the rotor a wobbling movement characteristic of vibration of rotating structures.
There are two basic types of vibration motor. 
An eccentric rotating mass vibration motor (ERM) uses a small unbalanced mass on a DC motor, when it rotates it creates a force that translates to vibrations.
 A linear resonant actuator (LRA) contains a small internal mass attached to a spring, which creates a force when driven.
The faster the motor spins, the more it feels like a vibration than a wobble. Playstation and Xbox controllers use a similar setup with larger motors to simulate the vibration function.

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​​**What is Cloud Seeding?

**Clouds are made up of tiny water droplets called cloud droplets. Groups of cloud droplets form water vapour (gas) or ice crystals. 
Water vapour isn’t dense enough to fall to the ground as precipitation. Instead, it rises into the sky and becomes supercooled. Eventually, it condenses (turns to a liquid) around tiny particles of dust in the sky. These tiny particles are called condensation nuclei. It takes billions of these condensed water droplets to form a visible cloud. 
When the water molecules are spread out, they aren’t dense enough to feel Earth’s gravity. When the molecules huddle together, they form larger, heavier droplets. Eventually, they become heavy enough to fall to the ground as precipitation. 
Cloud seeding involves modifying a cloud’s structure to increase the chance of precipitation. Cloud seeding adds small, ice-like particles to clouds. Usually, silver iodide particles are used. 
These particles act as additional condensation nuclei. Unattached supercooled water vapour molecules in the clouds condense around these particles. Then, the condensed water vapour droplets group together. This process continues until the droplets are large enough to fall as rain!  
There are two ways of adding particles to clouds: 
Using large cannons that shoot particles into the sky.
Using Airplanes/Drones that drop the particles from above.

​​What is Watermelon Snow?

Despite near-zero temperatures, acidity, solar irradiation, and minimal nutritional value, over sixty species of algae appear in the snow. The most common species of snow alga is Chlamydomonas nivalis, which colors snow red or pink. This phenomenon is called “watermelon snow” or “blood snow”. “Watermelon snow” forms as the summer sun heats up and melts winter’s leftovers. It is said to smell slightly sweet, a bit like watermelon.
The red pigment helps protect them from intense UV radiation experienced at high elevations and in ecosystems with no shade protection. In spring and summer, they are mobile, green cells.
Small creatures, like rotifers, nematodes, ice worms and springtails, feed on the algae in watermelon snow.
When these algae – typically green organisms – get a lot of sun, they produce a natural type of sunscreen (bright red carotenoids) that paints the slopes pink and red. The addition of color to the surface darkens the snow, allowing it to heat up faster, and melt more quickly. Algae changes snow’s albedo, causing decrease of 13% over the course of an Arctic melt season, compared with clean snow, meaning the dark snow would absorb much more light; it might cause a positive feedback loop (more snow melting, more algae blooms, darker surface, lowered albedo, higher temperature, more snow melting).