There was no astronaut named Nate Walker on Apollo 18. Apollo 18 was the final mission of the Apollo program, launched by NASA in 1972. The crew members on Apollo 18 were Charles Conrad, Jr., Paul J. Weitz, and Joseph P. Kerwin.
Day walker
The lava lamp was invented by Edward Craven Walker in 1963. Walker was inspired by an egg timer made of two liquids that he saw in a pub, which led him to create the iconic lava lamp design we know today.
The first fare-paying passenger in space who flew aboard the STS-41D spacecraft on August 30, 1984, was Charles "Charlie" Walker, an American engineer and businessman who conducted experiments in space as a payload specialist.
I'm not sure there was a first person, but I think the first flight to have a slinky in space was Space Shuttle flight 51-D launched in 1985 with a crew of David Griggs, Charles Walker, Karol J. Bobko, Donald E. Williams, Rhea Seddon & Jeffrey Hoffman. It was a slinky toy called a slinky mouse
Charles Vincent Walker was born in 1812.
Charles Vincent Walker died in 1882.
Charles Curwen Walker was born in 1856.
John Charles Walker died in 1994.
John Charles Walker was born in 1893.
Charles Howard Walker died in 1936.
Charles Howard Walker was born in 1857.
Charles Michael Walker was born in 1916.
Charles Michael Walker died in 2001.
Charles L. Walker was born in 1832.
Charles L. Walker died in 1904.
Charles Walker - liturgist - was created in 1868.