Allotropy is existence of a chemical element in two or more different states. When an element exists in more than one physical state, they are said to be allotropes.
Many different substances exhibits allotropy and it largely impacts their physical state.
Carbon has two main allotropes; graphite and diamond. Graphite is a soft substance and can easily be broken. Diamond is the hardest natural substance that is known.
A sulfur with a glassy luster and another with a dull earthy luster signifies two sulfur allotropes.
Most reasonable answer is the swallowable camera one. mris and cat scans were invented in the 70s and the rest of the answers are around the 1800s or before.
There are three primary areas of the brain that control your sense of smell: The orbitofrontal cortex, located above and behind the eyes. The insula, which lies beneath the ears. The piriform cortex, located between the other two. Besides these three areas, there are smaller brain regions that also play a part in smell.
