in fact, it's not that far removed from the st. ives riddle our children at the gate were talking about. both of these problems have elegant solutions by the recognition of the simple pattern of the powers of seven that we see. now, several centuries later, we find slightly more sophisticated kinds of problems and solutions in 6th-century b.c. india. the medical treatise sushruta samhita gives us this problem: how many combinations can be made out of six different tastes: bitter, sour, salty, sweet, astringent, and hot? by taking them one at a time, two at a time, three at a time, and so on, we learn that there are in fact 63 combinations. this was important in ayurvedic medicine because it gave ancient physicians a way to work out which medical substance would best match a patient's ailments. now, there are two things that are going on here. on the one hand, we're asking for the number of possible combinations, or subsets, of the six different spices. this number, as we see, is 63, which is 2^6 - 1. now, notice the sixth power and six

and i get concerned when i see names like the ceo of ives st.ng brought on board, that maybe this is being overplayed. if you think about what apple stands for, it stands for simplicity. it stands for clean design. and fashion is really about individual choices. so when you think about a company like apple, will this really fit with what they're doing, and will it move the needle for a company that that's large? i have my doubts about that. >> would you wear wearable technology, terry? >> no, i wouldn't wear it. >> the glasses? >> no, i wouldn't wear it. i get a little concerned about it. you can't have people cross the street today without getting beeped at by six different people, because they're tethered to their iphone today. can you imagine if they're looking at their wearable watches or wearable whatever, the wearable glasses? i mean we'll have people getting mowed down in the streets. i have 10-year-old twins, maria, and i'll tell you, technology has been a wonderful thing, and it's going to continue to grow, and it's good and really help