The erosion threshold of sand-mud mixtures is investigated by analyzing the momentum balance of a sand particle or a mud parcel in the mixture bed surface, and a formula for the critical shear stress ...

But Mother Nature often has more than a few tricks up her sleeve when you’re way out there, and one of her most common is leaving you to traverse a trail strewn with thick, slippery mud.

Bees, wasps, and hornets have found unique ways to survive in habitats all around the world. Mud daubers are a type of wasp that has developed a particularly interesting nesting behavior — they ...