topped vehicle can protect you from lightning..." and to "avoid using electronic equipment inside the car and avoid touching anything metal." If inside a building, avoid electrical equipment and plumbing including taking a shower. Risk remains for up to 30 minutes after the last observed lightning or thunder. It has been reported that "If you are on water, get to the shore and off wide, open beaches as quickly as possible as water will transmit strikes from further away. Studies have shown that proximity to water is a common factor in lightning strikes." It has been reported that "If you do not have anywhere to go, then you should make for the lowest possible ground like a valley or ravine." To not huddle up "...with other people in a group — spread out from your friends as much as you can." Notable incidents All events associated or suspected of causing damage are called "lightning incidents" due to four important factors. Forensic evidence of a lightning termination, in the best investigated examples, are minuscule (a pit in metal smaller than a pen point) or inconclusive (dark coloration). The object struck may explode or subsequent fires destroy all of the little evidence that may have been available immediately after the strike itself. The flash channel and discharge itself are not the only causes of injury, ignition, or damages, i.e., ground currents or explosions of flammables. Human sensory acuity is not as fine as that of the milliseconds in duration of a lightning flash, and people's ability to observe this event is subject to the brain's inability to comprehend it. Lightning-detection systems are coming online, both satellite and land-based, but their accuracy is still measured in the hundreds to thousands of feet, rarely allowing them to pinpoint the exact location of the termination. As such it is often inconclusive, albeit highly probable a lightning flash was involved, hence categorizing it as a "lightning incident" covers all bases. Earth-bound 1660s: In 1660, lightning ignited the gunpowder magazine at Osaka Castle, Japan; the resultant explosion set the castle on fire. In 1665, lightning again terminated on the main tower of the castle, igniting a fire, which subsequently burned it to its foundation. 1769: A particularly deadly lightning incident occurred in Brescia, Italy. Lightning struck the Church of St. Nazaire, igniting the 90 tonnes of gunpowder in its vaults; the resulting explosion killed 3,000 people and