Occasionally, I buy some recording that most of you can enjoy.
Not everyone has listened to them yet, but the CDs of the Feynman lectures were well worth whatever I paid for them. Lots of people teach physics, but he was an especially gifted lecturer. Go ahead and have some fun with physics!!
There’s no need to buy them, though!! You can enjoy listening to his lectures on youtube for free or read them online, also for zero dollars.
Be sure to tell your sister that one of his books is called, “What Do You Care What Other People Think?”