Positron emission tomography scan (PET scan) Positron emission tomography (PET) is a nuclear imaging technique that creates detailed, computerized pictures of organs and tissues inside the body. A PET scan reveals how the body is functioning and uncovers areas of abnormal metabolic activity. During a PET scan, the patient is first injected with a glucose (sugar) solution that contains a very small amount of radioactive material. The substance is absorbed by the particular organs or tissues being examined.
Kneisler used a hailstone that measured 5.581 inches in diameter and weighed 1.68 lbs (a hailstone that was previously the largest measured in the U.S.) to calculate numbers necessary to estimate the size of the great hailstones in Revelation 16:21. Kneisler also assumed that the great hailstones would weigh 75 lbs in his analysis.
Hail requires strong updrafts to keep the hydrometeors suspended to accumulate ice. The only clouds that can normally support these updrafts are cumulus or cumulonimbus (thunderstorm) clouds. <br /><br /> Hail requires TWO elements. One is an updraft and the other is that the water inside the cloud reaches the freezing level.