New protocol: A researcher is interested in studying how drinking cups of coffee at regular times every day may affect memory retention over one week. Participants 18 years or older will be randomized into two groups. Group A will drink two cups of coffee at 8 a.m., 11 a.m., 8 p.m., and 11 p.m. every day for 7 days. Group B will drink two cups of decaffeinated coffee at 8 a.m., 11 a.m., 8 p.m., and 11 p.m. every day for 7 days. The researcher will make this coffee available to participants. At 10 a.m. every day, participants will complete a memory game. What are the risks and benefits of the research