Penn Jillette of Penn and Teller fame has patented a "Hydro-Therapeutic Stimulator", which uses a hot tub for stimulation.
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| Number | Title | Issue Date |
| 5729393 | Optical flying head with solid immersion lens having raised central surface facing medium An air bearing assembly for an optical drive carries a solid immersion lens (SIL) having a bottom surface facing the disk contoured such that a central region where the optical path exits the bottom surface is closest to the recording medium regardless of... | 03/17/1998 |