For beverage purchases, 15% of the bill is automatically added to the Sail & Sign charge. Room Service staff may be tipped as service is rendered. Tipping applies regardless of the dining options selected, such as eating at the casual dining restaurant or Open Seating Dining.
Radium is a highly radioactive alkali metal. It undergoes alpha decay, which is radioactive decay by the release of an alpha particle from a nucleus. The alpha particle is a helium-4 nucleus, and it can do a lot of damage. If an individual is up against a radium source, or if he ingests or breathes radium, he will have tissues exposed to the extremely destructive radiation. That's what makes radium so dangerous. That and the fact that its radioactive decay daughters are also radioactive, and an individual exposed to radium and having that radium decay (causing biological damage) will then face the radiation hazards of the daughters of radium, because they are all radioactive, too.
Exposure to lead is dangerous because this heavy metal is a toxin which can cause severe health problems and death at high levels of exposure. Humans have been working with lead for centuries, and giving themselves lead poisoning at the same time due to a lack of understanding about the risks of lead exposure.