Since 1992, 1ps and 2ps have been made out of copper-plated steel instead of the previous alloy of copper, tin and zinc. Steel is magnetic so pennies made after 1992 will be attracted to the magnet when it is close to them. Pennies made before this will not be magnetic.…
A. Calcium and potassium are both metals. Incorrect. Determination of similar or different chemical properties is based on the number of electrons in the outer energy shells, not classification (i.e. metal, non-metal, etc.) This article contains comparison of key thermal and atomic properties of potassium and calcium, two comparable chemical…
Astronomers thought they had it all figured out. A dying star either fades into a simmering white dwarf, explodes and then shrinks into a super-dense neutron star or collapses into an all-consuming black hole, depending on its mass. A giant star faces several possible fates when it dies in a…
Mass stays the same regardless of location and gravity. You would have the same mass on Mars or Jupiter as you do here on Earth. Your weight is different on other planets due to gravity. However, your mass is the same everywhere! We tend to think of gravity as a…
Although rarely fatal, victims of tarring and feathering attacks were not only humiliated by being held down, shaved, stripped naked and covered in a boiled sticky substance and feathers, but their skin often became burned and blistered or peeled off when solvents were used to remove the remnants. Tar, even…
Insertion or deletion of three (or multiples of 3) nucleotides does not result in a frameshift mutation. It only results in the presence (or absence) of some amino acids in the polypeptide. 2. How can a frameshift mutation caused by a single nucleotide drastically change the length of a polypeptide?…
Age is not a disease, and your dog is never “too old” to receive the quality care he or she needs, even if it requires anesthesia and surgery. Should older dogs go through surgery? Is it right to put them under? Dr. Reese says that even veterinarians struggle with this…
The true Stone Cold stunner as popularized and stated by Steve Austin, always involves a boot to the gut before the three-quarter facelock is applied. Kevin Owens has also used this variation as a finisher. Of course, you can argue whether any wrestling move really hurts but the various flips…
Signs and symptoms of generalized tetanus include: Painful muscle spasms and stiff, immovable muscles (muscle rigidity) in your jaw. Tension of muscles around your lips, sometimes producing a persistent grin. Painful spasms and rigidity in your neck muscles. The most common initial sign is spasms of the muscles of the…
The stomach makes gastric amylase, which plays a minor role in digesting starch in the stomach. Starch, which is sugar stored in the form of long branching chains, is mainly broken down by other digestive organsdigestive organsThe human digestive system consists of the gastrointestinal tract plus the accessory organs of…