Apart from the giant yellow bird, the red furry monster and the blue Muppet with an insatiable appetite for cookies, “Sesame Street” appears as real as the New York City streets that inspired it.

"Sesame Street" has introduced a new Muppet with the aim of highlighting the stories and unique love of foster families. The center of the new initiative is a Muppet named Karli, a yellow-haired ...