During the warm months of the year, ladybugs are like adorable, bright-colored lapel pins. They land on us, accessorize our clothing in brilliant red or orange with stylish black spots, and are delightful to have around. Several cultures even think of ladybugs as good luck charms for anything from marriage to childbirth to the weather to a good harvest. Then fall arrives and the ladybugs need to find warmth, which is most available inside people’s homes – where they often descend in large numbers. Suddenly they’re not as cute to many people as they seemed outdoors. But Jessica Ware, an insect expert and assistant professor of biology at Rutgers University-Newark, says having ladybugs indoors serves a very useful purpose, and humans should welcome their temporary houseguests.