Zebras are intelligent and sentient animals. Zebras stand between 1.10 and 1.50 meters tall at the shoulder and can weigh up to 450kg. Despite their size, they are fast runners, reaching speeds of up to 65 km/h to escape predators.
Dolphins are considered one of the world's most intelligent animals, and they have several cognitive abilities that set them apart. Many researchers consider intelligence to be a combination of perception, communication, and problem-solving.
Research studies have found knitting to be associated with reduced levels of stress2, subjective improvement in cognitive functioning3, and a lower risk of cognitive decline4, mild cognitive impairment5, and dementia6,7,
Ancient Roman concrete arches contained volcanic ash, which helped them self-heal when cracks formed by reacting with water. This made them incredibly durable, lasting for millennia.
