Apologies for any confusion. Here’s the revised lead paragraph without any extra descriptions:
Getting caught in a storm is never pleasant – even if you are dressed for the weather. But putting the umbrella away and letting your hair get wet could help save your life when lightning strikes. Researchers have found that rainwater on the scalp acts like a protective ‘shell’ during lightning, reducing the electrical current entering the brain. The purity of rainwater makes it a poor conductor of electricity, unlike contaminated tap water. The study suggests that having a wet head could increase survival chances from 70 percent to 90 percent.