A man cave, sometimes a mantuary or manspace, is a male sanctuary, such as a specially equipped garage, spare bedroom, media room, den, or basement. It is not a cave but rather a metaphor describing a room inside the house, such as the basement or garage or attic or office, or outside the house such as a wood shed or tool room, where "guys can do as they please" without fear of upsetting any female sensibility about house decor or design. Paula Aymer of Tufts University calls it the "last bastion of masculinity".

While a wife may have substantial authority over a whole house in terms of design and decoration, she generally has no say about what gets "mounted on the walls" of a man's personal space. Since it may be accepted that a woman has input on the decoration of the rest of the house, a man cave or man space is in some sense a reaction to feminine domestic power.

Man caves have multiple purposes: they're a place to be alone, to be away from women and from female sensibilities, to indulge in hobbies, and to hang out with male friends. It is, loosely, a male-only space to retreat to, Man Caves, watch sports matches, or play video games. According to psychiatrist and author Scott Haltzman, it is important for a man to have a place to call his own, referring to a male area to which to retreat. Some psychologists claim that a man cave can provide refuge from stressful surroundings and be beneficial to marriage. Rules are relaxed; it is a place where other people's sensibilities about standards of cleanliness are not necessarily observed; as one man said, "You spill a beer there or leave a hamburger overnight, who cares?"

In English, lower case man (pl. men) refers to an adult human male (the term boy is the usual term for a human male child or adolescent). Sometimes it is also used as an adjective to identify a set of male humans, regardless of age, as in phrases such as "men's rights". Although men typically have a male reproductive system, some intersex people with ambiguous genitals, and biologically female transgender people, may also be classified or self-identify as a "man".

The term manhood is used to refer to masculinity, the various qualities and characteristics attributed to men such as strength and male sexuality.

The English term "man" is derived from Old English mann. The Old English form had a default meaning of "adult male" (which was the exclusive meaning of "wer"), though it could signify a person of unspecified gender. The closely related "man" was used just as it is in Modern German to designate "one" (e.g., as in the saying Man muss mit den Wölfen heulen). The Old English form is derived from Proto-Germanic *mannaz, "persona", which is also the etonym of German Mann "man, husband" and man "one" (pronoun), Old Norse maðr, and Gothic manna. According to Tacitus, the mythological progenitor of the Germanic tribes was called Mannus. The Germanic form is in turn derived from the Proto-Indo-European root *manu-s "man, person", which is also the root of the Indian name Manu, mythological progenitor of the Hindus.

A cave or cavern is a natural underground space large enough for a human to enter. The term applies to natural cavities some part of which is in total darkness. The word cave also refers to smaller spaces like rock shelters, sea caves, and grottos.

Speleology is the science of exploration and study of all aspects of caves and the environment which surrounds the caves. Exploring a cave for recreation or science may be called caving, potholing, or, in Canada and the United States, spelunking (see caving).

The formation and development of caves is known as speleogenesis. Caves are formed by various geologic processes. These may involve a combination of chemical processes, erosion from water, tectonic forces, microorganisms, pressure, atmospheric influences, and even digging.

Most caves are formed in limestone by dissolution.

Solutional caves are the most frequently occurring caves and such caves form in rock that is soluble, such as limestone, but can also form in other rocks, including chalk, dolomite, marble, salt, and gypsum. Rock is dissolved by natural acid in groundwater that seeps through bedding-planes, faults, joints and so on. Over geological epochs cracks expand to become caves or cave systems.

Adam Whitney Savage (born July 15, 1967) is an American industrial design and special effects designer/fabricator, actor, educator, and co-host of the Discovery Channel television series MythBusters. His model work has appeared in major films, including Star Wars: Episode II - Attack of the Clones and The Matrix Reloaded. He is a prominent member of the skeptic community. He lives in San Francisco with his twin sons and wife, Julia.

Born in New York City, Savage was raised in Sleepy Hollow in Westchester County New York. He graduated from Sleepy Hollow High School in 1985. His father, Whitney Lee Savage (1928-1998), was a painter, filmmaker and animator known for his work on Sesame Street, and has a permanent exhibit in the Avampato Discovery Museum. His mother is a psychotherapist. His sister Kate Savage is also an artist. As a teenager in Sleepy Hollow, he routinely visited the local bike shop to have flat tires fixed. The shop showed him how to do the repairs himself. From this experience, Savage said, "I realized you could take a bike apart and put it back together and it wasn't that hard...I've been building and putting bicycles together since then."

James Walter "Jimmy" Castor (June 23, 1940 – January 16, 2012) was an American pop and funk musician. He is best known as a fun disco/funk saxophonist, with his biggest hit single being 1972's million seller, "Troglodyte (Cave Man)".

Castor started as a doo-wop singer in New York. He wrote and recorded "I Promise to Remember" in 1956. Castor then replaced Frankie Lymon in The Teenagers in 1957 before switching to the saxophone in 1960. He had a solo hit with "Hey Leroy, Your Mama's Callin' You" on Smash Records in 1966. Castor also played sax on Dave "Baby" Cortez's hit "Rinky Dink." He formed the Jimmy Castor Bunch in 1972 and signed with RCA. As leader of The Jimmy Castor Bunch in the 1970s, and also as a solo artist, he has released several successful albums and singles. The group reached the peak of their commercial success in 1972 with the release of their album, It's Just Begun, which featured two hit singles: the title track and "Troglodyte (Cave Man)," which was a large hit in the U.S., peaking at #6 in the Billboard Hot 100. The track stayed in the chart for 14 weeks and was a million seller by 30 June 1972, and received a gold disc award from the R.I.A.A.