A young scientist discovered a strange signal in 1967. This signal came from a rapidly rotating stellar corpse, a pulsar. Pulsars are collapsed stars that emit powerful energy rays. Their discovery confirmed theories about neutron stars. These cosmic clocks help scientists test physics and study space-time. The discovery changed our understanding of the universe.

In 1978, utility workers in Mexico City unearthed the massive Coyolxauhqui Stone, a significant Aztec artefact. This discovery revealed the Templo Mayor, the empire's religious and political centre, buried beneath the modern city. The find initiated a major archaeological dig, uncovering a vast complex and demonstrating that Aztec history remains present beneath the urban landscape.

Mount Uturuncu, a Bolivian volcano, is not on the brink of a massive eruption as previously feared. New research reveals its 'zombie' behaviour stems from migrating hydrothermal fluids and gases, not an imminent magma buildup. While still active and hot, this discovery reduces immediate eruption concerns, suggesting the volcano is expelling steam rather than preparing to explode.

Ancient Neanderthals practiced sophisticated dental care, performing effective procedures around 60,000 years ago. Archaeological findings reveal a molar with an intentionally drilled hole, suggesting a deliberate attempt to relieve pain from infection. This discovery highlights a deep-seated human drive for healing and mutual support, predating modern medicine and challenging outdated perceptions of our ancient relatives.

A 2,000-year-old Polish church, long baffling historians with its lack of an entrance, has revealed its secret. New research suggests the rotunda wasn't a standalone structure but part of a royal palace complex. An enclosed walkway likely connected it to royal residences, making an external door unnecessary and preserving privacy.