1) Leonardo DiCaprio is an acclaimed American actor and environmental activist. He has starred in numerous successful films, including "Titanic," "The Revenant," and "The Wolf of Wall Street," and has been recognized with several awards, including an Academy Award.

2) The Earth's core is primarily composed of iron and nickel and is as hot as the surface of the sun.

3) The insurance industry employs a wide range of professionals, including underwriters, actuaries, claims adjusters, and insurance agents.

4) The Internet of Things (IoT) refers to the network of physical devices, vehicles, appliances, and other objects embedded with sensors, software, and connectivity.