I2-U2 stands for India, Israel, UAE, and the US, per diplomatic records (e.g., Indian Ministry of External Affairs).

The AIIB was initiated by China in 2015 for infrastructure funding, per official AIIB records.

Water-soluble vitamins (B, C) are excreted, fat-soluble vitamins (A, D, E, K) are stored, and excess fat-soluble vitamins can accumulate, per nutrition science (e.g., “Modern Nutrition” by Shils).

Soil microbes decompose organic matter, recycling nutrients to maintain fertility, more directly than crop residue or moisture, per soil science (e.g., “Soil Microbiology” by Tate).

Earth’s average density (~5.5 g/cm³) exceeds surface rock density (~2.7–3.0 g/cm³), indicating a dense metallic core, confirmed by seismic studies, per geophysics (e.g., “Earth” by Tarbuck).

Solar, geothermal, and tidal energy are naturally replenished, making them renewable, per energy science (e.g., IEA reports).

Machine learning is a subset of AI, focusing on data-driven algorithms, distinct from hardware engineering or cyber forensics, per AI texts (e.g., “Artificial Intelligence: A Modern Approach”).

Drum printers are impact printers, similar to chain printers, using rotating mechanisms, distinct from non-impact inkjet or laser printers, per computer history (e.g., “Computer Architecture” by Tanenbaum).

Acetylene, mixed with oxygen, produces a high-temperature flame for gas welding, as per welding technology sources (e.g., AWS Welding Handbook).

Vitamin K is essential for blood clotting; its deficiency causes excessive bleeding, unlike Vitamin C (scurvy) or B (various deficiencies), per medical references (e.g., Merck Manual).