A spider’s silk is around 3 micrometers (0.003 millimeters) in diameter, so it is very thin. It is useful to think of a rope made of many threads as an analogy. A single thread could never hold up a person, … Continue reading →

The reason is that as the battery gets more full, it has to be charged more slowly. In this example, fast charging above 80 to 90% of the battery is less useful, since charging will get progressively slower. Why is … Continue reading →

Hand Sanitiser, Diamonds and Gemstones Using hand sanitiser while wearing a ring is unlikely to cause any immediate damage to diamonds and gemstones, but can cause wear and tear over time. Because the chemicals in hand sanitiser leave a residue, … Continue reading →

Because loose diamonds are so dense, they should sink to the bottom when dropped in a glass of water. Many diamond fakes – glass and quartz included – will float or not sink as quickly because they’re less dense. How … Continue reading →

Most pistol bullets are made of a lead-antimony alloy encased in a soft brass or copper-plated soft steel jacket. In rifle and machine-gun bullets, a soft core of lead is encased in a harder jacket of steel or cupronickel. Armour-piercing … Continue reading →

Rumble announced its own SPAC merger on Dec. 1, revealing its agreement with CF Acquisition Corp VI. Its press release indicates it will step onto the public trading stage with an initial enterprise value of $2.1 billion. Is Rumble a … Continue reading →

The 7.62×39mm (aka 7.62 Soviet formerly .30 Russian Short) round is a rimless bottlenecked intermediate cartridge of Soviet origin. The cartridge is widely used due to the worldwide proliferation of Russian SKS and AK-47 pattern rifles, as well as RPD … Continue reading →

While unproven, some apocryphal accounts state that at the time of her betrothal to Joseph, Mary was 12–14 years old. According to ancient Jewish custom, Mary could have been betrothed at about 12. Hyppolitus of Thebes says that Mary lived … Continue reading →

This Is a great battery pack. They charge fairly quickly and the 1st charge lasted at least 10-12 hours. How long do venom rechargeable batteries last? Venom’s Twin Rechargeable Battery Packs charge two battery packs from just one USB cable … Continue reading →

They are used to power small electronics devices such as calculators, wrist watches, various medical devices, fitness appliances, toys etc. What uses a 3 volt lithium battery? The Energizer 3-volt lithium photoelectronic battery was designed for use in photographic devices, … Continue reading →

RC car batteries will last for about one to two hours before they should be recharged. However, RC batteries should last for up to three to six months. RC batteries die fast because the engines of the RC cars are … Continue reading →

Do my batteries need to be certified or listed by Underwriters Laboratories (UL)? No. Recently, some OEM’s have begun using the claim that batteries must be certified by UL as an artificial barrier to protect their battery sales. There is … Continue reading →

Grade A cell is the name of the battery’s high-quality standard. Grade A LiFePO4 battery cells are within the range of technical parameters in all aspects of the parameters, the appearance is intact(no damage), no swelling, amd no abnormal battery … Continue reading →

Demineralised water versus distilled water Demineralised water is water that has been purified in such a way that (most of) its mineral- and salt ions are removed. You can think for example of Calcium, Chloride, Sulphate, Magnesium and Sodium. Demineralised … Continue reading →

The plates in 6-volt batteries are much thicker, meaning they can be charged and discharged more frequently. They have a longer lifespan. Because they have half the number of plates in their cells, 6-volt batteries weigh less. What is the … Continue reading →