Internet searches for the keyword acronym “UFO” (unidentified flying object) are among the most popular on the Internet. According to Google, there are five million global searches per month for the keyword acronym “UFO”(without the quotes). Let us start with …

### Time Travel

The Tipler cylinder is a cylinder of dense matter and infinite length. Historically, Dutch mathematician Willem Jacob van Stockum (1910–1944) found Tipler cylinder solutions to Einstein’s equations of general relativity in 1924. Hungarian mathematician/physicist Cornel Lanczos (1893–1974) found similar Tipler …

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