Decades: 1970s 1980s 1990s 2000s 2010s - 2020s - 2030s 2040s 2050s 2060s 2070s
Years: 2021 2022 2023 2024 2025 - 2026 - 2027 2028 2029 2030 2031
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... for a variety of reasons: The placebo effect. Medicines or treatments, known to have no effect on a disease, can have major effects on a person's perception of their ...