undercooled liquid metal printing rose petals

Liquid metal prints connections on fragile surfaces

Undercooled liquid metal can print solid electrical connections without heating the surface. The method has been used on fragile materials such as paper and gelatin, and even on water-repellent rose petals.

Mongol messengers crossed vast distances by constantly changing horses

The Mongol Empire maintained a relay network of stations stocked with fresh horses and supplies. Official messengers could ride from station to station without waiting for one exhausted horse to recover. Under favorable conditions, this allowed messages to travel extraordinary distances in a single day, helping rulers coordinate an empire stretching across Eurasia.

Elizabeth I treated an explorer's voyage as a state secret

After Francis Drake returned from his circumnavigation in 1580, England had valuable information about distant coasts, trade routes and Spanish possessions. The government restricted details of the expedition, partly to keep them from rival Spain. Geographic knowledge was a strategic asset, not merely an interesting record of exploration.

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undercooled liquid metal printing rose petals

Liquid metal prints connections on fragile surfaces

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