The Transcontinental Burrito Hypertunnel (References)
The Correspondence of Isaac Newton | History and philosophy of physics and astronomy. Cambridge University Press https://www.cambridge.org/ec/academic/subjects/physics/history-philosophy-and-foundations-physics/correspondence-isaac-newton-volume-2, https://www.cambridge.org/ec/academic/subjects/physics/history-philosophy-and-foundations-physics.
Maxham, A. Brachistochrone inside the Earth: The Gravity Train. http://www.physics.unlv.edu/~maxham/gravitytrain.pdf
Selmke, M. A note on the history of gravity tunnels. American Journal of Physics 86, 153–153 (2018).
Simoson, A. J. Falling down a Hole through the Earth. Mathematics Magazine 77, 171 (2004).
Cooper, P. W. Through the Earth in Forty Minutes. American Journal of Physics 34, 68–70 (1966).
Duane Roberts actually invented the frozen burrito: https://www.ocregister.com/2007/07/19/burrito-king-grows-from-frozen-to-fine-dining/