When I was a kid, I wanted to become a broadway singer aside from being a scientist.. And since I was not able to be any of the two at this moment, at least through Soundcloud, I became a professional singer (on my own!) Lol! So please bear with my trying hard cover of For the First Time in Forever. :D
You’re right: it is in fact OK to begin a sentence with “because.”
Here is a tweet that answers your question:
Here are two more examples in which “because” is correctly used to begin their respective sentences:
As along as you establish a cause and effect relationship, you can…
The Human Brain
The first time I held a human brain in Anatomy Lab I was completely speechless. I looked at my classmates expecting a similar reaction and they looked back at me confused like…”dude let’s start identifying the structures.” I had to take a step back and let it process…in my hands was someone’s entire life. From start to finish, every memory, every emotion, every bodily control…was right there in my hands.