The term 'smallest of specks' can be summarized by the word 'MITE', which is a four-letter word. Mites are tiny arthropods, usually less than 1 millimeter in size, and are found in many different habitats. They are related to spiders and ticks, and are often considered pests due to their ability to cause skin irritation and allergies. Mites are also important in the food chain, as they are a major food source for many animals.