A hot spring is a spring that is produced by the emergence of geothermally heated groundwater from the Earth's crust. There are geothermal hot springs in many locations all over the crust of the earth.

There is no universally accepted definition of a hot spring. For example, one can find the phrase hot spring defined as

The related term "warm spring" is defined as a spring with water temperature less than a hot spring by many sources, although Pentecost et al. (2003) suggest that the phrase "warm spring" is not useful and should be avoided. The US NOAA Geophysical Data Center defines a "warm spring" as a spring with water between 20 and 50 °C (68 and 122 °F).

The water issuing from a hot spring is heated by geothermal heat, i.e., heat from the Earth's mantle. In general, the temperature of rocks within the earth increases with depth. The rate of temperature increase with depth is known as the geothermal gradient. If water percolates deeply enough into the crust, it will be heated as it comes into contact with hot rocks. The water from hot springs in non-volcanic areas is heated in this manner.

Beyond Words is a 1997 documentary film directed by Louis van Gasteren.

Shot in India partly in 1967 in 35mm film and partly thirty years later in 1997 in video, Beyond Words is one of only three or four films ever shot of the silent master Meher Baba that include synchronized sound and the only film shot of him in 35mm color. In the film van Gasteren deftly interviews Meher Baba on finding God within the self, drugs, and cinema. Meher Baba's silent gestures are interpreted in English by disciple Eruch Jessawala. It was one of the last films and by far the most professional ever shot of Baba, with cinematography by Jan de Bont.

The Meher Baba footage in Beyond Words was originally planned by van Gasteren to be included in a longer film titled Nema Aviona Za Zagreb (No Plane for Zagreb) which was never completed. After a long period of consideration van Gasteren finally released the unseen footage in Beyond Words in 1997. Although Gasteren did not show the 1967 footage of the film publicly for 30 years, he allowed Pete Townshend of The Who to include two still frames inside the gatefold cover of his 1972 Meher Baba tribute album Who Came First. Van Gasteren also interviewed and filmed Timothy Leary in Millbrook, New York for the film No Plane for Zagreb. The footage of Leary does not appear in Beyond Words.