Pure gypsum is a white rock but sometimes impurities colour it grey, brown or pink. Its scientific name is calcium sulphate dihydrate and its chemical formula is CaSO42H2O. This means that, for every molecule of gypsum, there are two molecules … Continue reading →

This one has come up a lot recently on the Arduino subreddit and Electronics stackexchange – can I power my Arduino with a 9V battery? The quick answer is yes, you can. Can Arduino Uno output 9V? Yes. Just take … Continue reading →

Hair is strong. A single strand could hold 100g (3oz) in weight: the combined hair of a whole head could support 12 tonnes, or the weight of two elephants. Weight for weight, it is not as strong as steel: more … Continue reading →

In the case of a human hair, 200 megapascals is 20,000,000 kilograms of force per square meter of human hair. Those are some big numbers. They mean that a single strand of hair is about half as strong as a … Continue reading →

Want Stronger, Healthier Hair? Try These 10 Tips Turn down the heat. Take vitamins. Use less shampoo. Massage your scalp. Eat more protein. Make an egg yolk mask. Use a cool rinse. Apply aloe. Why is my hair roots so … Continue reading →

Do you need a power supply for pedals? It’s important to have the right pedal power supply to ensure your pedals give you sound when plugged in and won’t fail you when playing live. Do guitar pedals come with power … Continue reading →

Synthetic diamond scalpel blades are commercially available and well liked by surgeons. Contrary to what you might think they stay sharp much better than steel and chipping doesnt seem to be a problem. Quoted sharpness is 3 nm and achieved … Continue reading →

Use a Workable Fixative like Krylon. “Workable” means you can add layers of graphite over the drawing after it has been sprayed. Once a drawing has been sprayed, the graphite underneath will NOT erase. It is FIXED! How do you … Continue reading →

300,000 pencils. Cedar wood is commonly used to make pencils. The best trees are around 14-years-old since they’re mature enough to be cut down. 1 tree can make up to 300,000 pencils. How many pencils does the average tree make? … Continue reading →

In regards to pen position, ballpoint pens that use gel ink should be stood upright. This will prevent them leaking. Traditional ballpoint pens that use oil based ink should be stored vertically so the thinner ink moves to the bottom … Continue reading →

One reason that the alarm is going off all the time could be simple: It needs a new battery as soon as possible. Batteries ought to be replaced annually, so it is worth getting into the habit of changing them … Continue reading →

Graphite is relatively nonpoisonous. There may be no symptoms. If symptoms do occur, they may include stomachache and vomiting, which could be from a bowel obstruction (blockage). The person may choke while swallowing the pencil. Is it healthy to eat … Continue reading →

The most effective method against cellulite is to improve blood circulation and lymphatic drainage through massage. Draining not only stimulates blood and lymph circulation, but also breaks down the fat cells that cause cellulite groups. Draining massage can be performed … Continue reading →

Figure 1: Charge stages of lithium-ion Manufacturers of these cells recommend charging at 0.8C or less to prolong battery life; however, most Power Cells can take a higher charge C-rate with little stress. Charge efficiency is about 99 percent and … Continue reading →

Grocery stores across the United States are seeing empty shelves that once held products ranging from bread to produce to meat, as a surge in COVID-19 cases due to the Omicron variant adds another layer of complication to a system … Continue reading →