

Maybe try Anki ? It is specifically designed to help memorize stuff long term through spaced repetition.
You will need to create you own cards or find someone else’s cards. Later after learning a card, it will magically schedule a review at the best time to not forget it.
It really help me to learn vocabulary. (enable FSRS from the beginning)
Worldwide diesel/kerosene biofuel production is too low. Last time airbus made a demo on 100% biofuel made from algae, they bought the output of a whole year to run a single long haul flight.
There is a reason they say Sustainable Aviation Fuel (SAF) and not biofuel. They also need e-fuel / synthetic fuel made from hydrogen in addition to biofuel.