Latest articles by Joseph Castro
Homo floresiensis: facts about the 'hobbit'
Homo floresiensis, a diminutive hominin dubbed the hobbit, lived about 17,000 years ago on a remote Indonesian island.
Triceratops: Facts about the three-horned dinosaur
Triceratops lived at the end of the Cretaceous period, between 67 million and 65 million years ago. Once considered solitary, new fossil discoveries indicate it was a social animal that may have lived in herds.
How fast does hair grow?
The rate at which hair grows depends on many factors, including the person's age, race and diet.
Animal Sex: How Mosquitoes Do It
Mosquito reproduction involves swarms, behavior-altering seminal fluid and tons of eggs.
Do cows really lie down when it's about to rain?
Can cows predict when it's going to rain?
Probiotic Yogurt May Aid Digestion of Carbs
How do probiotics affect your gut microbes?
Pterodactyl: Facts about pteranodon and other pterosaurs
Reference Pterodactyls soared in the skies during the age of the dinosaurs and include some of the largest flying reptiles ever.
Jumping Spiders' Unique Vision Revealed
Jumping spiders gauge distances by compared a focused image with a defocused image.
11 Surprising Facts About the Circulatory System
The human circulatory system was once a subject of great mystery, but now, modern science has revealed its inner workings. Here are 11 surprising facts about the human circulatory system.
Pregnant Monkeys Miscarry to Avoid Infanticide
The "abortion" keeps new males from killing the mama's babies.
When was Jesus born?
Reference Although millions of people celebrate the birth of Jesus Christ on Dec. 25, most scholars agree that he wasn't born on that day, or even in the year 1 A.D.
Archaeopteryx: The Transitional Fossil
Archaeopteryx was an evolutionary link between non-avian dinosaurs and birds.
Do Animals Get Jealous?
Research suggests that dogs and non-human primates experience jealousy just like humans.
Do Animals Have Humor?
Between verbal jokes, slapstick comedy and tickling, there are numerous reasons we laugh. But are humans the only species with a sense of humor?
Do Animals Have Menopause?
Female killer whales reproduce between the ages of 12 and 40 years but can survive into their 90s.
Do Animals Murder Each Other?
Animals regularly murder their own kind, and many species do so at a much higher rate than humans.
Animal Sex: How Meerkats Do It
Meerkats are anything but meek — including when it comes to their mating behaviors.
Animal Sex: How Red-Eared Sliders Do It
Red-eared slider reproduction involves large claws, extra-long penises and numbers of eggs.
Animal Sex: How Western Toads Do It
Western toad sex involves quiet searches, mating balls and streams of eggs.
Animal Sex: How Narwhals Do It
Little is known about the mating behaviors of arctic-loving narwhals, also called the unicorns of the sea.
Ankylosaurus: Facts About the Armored Lizard
Thick plates protected this massive dinosaur from predators.
