Walking Raises Creativity by 60% (study – applies to Qigong)

White lead is the basic lead carbonate (2PbCO3·Pb(OH)2). It is a complex salt, containing both carbonate and hydroxide ions. White lead occurs naturally as a mineral, in which context it is known as hydrocerussite, a hydrate of cerussite. It was formerly used as an ingredient for lead paint and a cosmetic called Venetian Ceruse, because of its opacity and the satiny smooth mixture it made with dryable oils. However, it tended to cause lead poisoning, and its use has been banned in most countries…the commonly known Dutch method for the preparation of lead white was described as early as Theophrastus of Eresos (ca. 300 B.C.), in his brief work on rocks or minerals, On Stones or History of Stones. His directions for the process were repeated throughout history by many authors of chemical and alchemical literature…white lead has been the principal white pigment of classical European oil painting. There have been claims that it is partly responsible for darkening of old paintings over time, reacting with trace amounts of hydrogen sulfide in the air to produce black lead sulfide. Other authorities dispute this; the most traditional view is that impermanent pigments and dirty varnish (which is often cleanable) are more likely responsible for darkening.
-https://en.wikipedia.org/wiki/White_lead

A shot tower is a tower designed for the production of shot balls by freefall of molten lead, which is then caught in a water basin. The shot is used for projectiles in firearms.
-https://en.wikipedia.org/wiki/Shot_tower

When did they start to use either iron or lead shots as extra weight?
-http://forum.healingdao.com/practice/message/25419/