Geology (from the Greek γῆ, gê, "earth" and λόγος, logos, "study") is the science comprising the study of solid Earth, the rocks of which it is composed, and the processes by which it evolves. Geology gives insight into the history of the Earth, as it provides the primary evidence for plate tectonics, the evolutionary history of life, and past climates. In modern times, geology is commercially important for mineral and hydrocarbon exploration and for evaluating water resources; is publicly important for the prediction and understanding of natural hazards, the remediation of environmental problems, and for providing insights into past climate change; plays a role in geotechnical engineering; and is a major academic discipline.

The study of the physical material of the Earth dates back at least to ancient Greece when Theophrastus (372-287 BCE) wrote the work Peri Lithon (On Stones). In the Roman period, Pliny the Elder wrote in detail of the many minerals and metals then in practical use, and correctly noted the origin of amber.

Brad Douglas Paisley (born October 28, 1972) is an American singer-songwriter and musician. His style crosses between traditional country music and Southern rock, and his songs are frequently laced with humor and pop culture references.

Paisley was the 2008 CMA and ACM Male Vocalist of the Year winner. Starting with the release of his 1999 album Who Needs Pictures, Paisley has recorded seven studio albums and a Christmas compilation on the Arista Nashville label, with all of his albums certified gold or higher by the RIAA. In addition, he has charted 25 singles on the U.S. Billboard Hot Country Songs chart, 16 of which have reached #1 with a record 10 consecutive singles reaching the top spot on the chart. On November 10, 2010, Paisley won the Entertainer of the Year award at the 44th annual CMA Awards.

Paisley was born on October 28, 1972 in Glen Dale, West Virginia to Douglas Edward "Doug" Paisley, who worked for the West Virginia Department of Transportation, and Sandra Jean "Sandy" (née Jarvis) Paisley, a teacher. He was raised in Glen Dale, West Virginia. He has stated that his love of country music stems from his maternal grandfather, Warren Jarvis, who gave Paisley his first guitar, a Sears Danelectro Silvertone at 8-years-old and taught him how to play. At age 10, he performed for the first time in public by singing in his church. He later recalled that, "Pretty soon, I was performing at every Christmas party and Mother's Day event. The neat thing about a small town is that when you want to be an artist, by golly, they'll make you one". At age 12, Paisley wrote his first song, entitled, "Born on Christmas Day". He had been taking lessons with local guitarist Clarence "Hank" Goddard. By age 13, Goddard and Paisley formed a band called "Brad Paisley and the C-Notes", with the addition of two of Paisley's adult friends.

Stephen William Hawking, CH, CBE, FRS, FRSA (born 8 January 1942) is a British theoretical physicist, cosmologist, and author. His key scientific works to date have included providing, with Roger Penrose, theorems regarding gravitational singularities in the framework of general relativity, and the theoretical prediction that black holes should emit radiation, which is today known as Hawking radiation (or sometimes as Bekenstein–Hawking radiation).

He is an Honorary Fellow of the Royal Society of Arts, a lifetime member of the Pontifical Academy of Sciences, and in 2009 was awarded the Presidential Medal of Freedom, the highest civilian award in the United States. Hawking was the Lucasian Professor of Mathematics at the University of Cambridge between 1979 and 2009. Subsequently, he became research director at the university's Centre for Theoretical Cosmology.

Hawking has a motor neurone disease related to amyotrophic lateral sclerosis, a condition that has progressed over the years. He is now almost completely paralysed and communicates through a speech generating device. He has been married twice and has three children. Hawking has achieved success with works of popular science in which he discusses his own theories and cosmology in general; these include A Brief History of Time, which stayed on the British Sunday Times best-sellers list for a record-breaking 237 weeks.