Day 9: The Cell (human body: 100 trillion), Eukaryotic Cells, Peptideins

3 min read

Day 59: Evolution (General)

2 min read

Day 78: Global Births, Global Fertility Rate (2.25), Replacement Rate (2.1)

4 min read

Day 61: History (America and World), Historical Documents, Archaeology, Fossils

3 min read

Day 11: The Earth (Overall), Arctic Circle, Rotation, Plate Tectonics, Pangea (Laurasia: Northern and Gondwanaland: Southern), Rocks, Caves

5 min read

Day 12: Earth's Atmosphere, Structure, and Magnetic Field

4 min read

Day 36: Environment, Conservation and Refuges, Nature, Ecosystems, Resources (Earth Overshoot Day: July 24th 2025), Human Impact

3 min read

Day 13: Seasons, Earth's Ellipsoid Shape (23.5-degree tilt)

3 min read

Day 22: Life on Earth (3.8 billion years ago), Great Oxidation Event (GOE: 2.3 billion years ago)

4 min read

Day 19: Mountains, Avalanches, Appalachian Region, Rocky Mountains, Mount Everest

3 min read

Day 14: Time, Time Spent, Time Zones, Daylight Saving Time, Day Length, Leap Years (365.25 days), Summer Solstice, Winter Solstice, Stonehenge

5 min read

Day 45: Earthquakes (500,000 annually), Tectonic Plates, Ring of Fire (90% of earthquakes)

3 min read

Day 47: Clouds, Lightning and Thunder, Tornadoes

3 min read

Day 307: Nervous System (The Brain and Spinal Cord), Brain Scans, Left-Handedness

4 min read

Day 306: Digestive System, Eating, Burping, Gastroenterology, Prebiotics, Probiotics, Colonoscopy, Pooping, Indigestion, Gut-Brain Axis

5 min read

Day 297: Muscular System, Muscles, Glutes

2 min read

Day 305: Urinary System (Kidneys, Ureters, Bladder, Urethra)

2 min read

Day 298: Skin, Integumentary System, Moles, Tattoos

2 min read

Day 108: Puberty

3 min read

Day 295: Height, Growth Periods

3 min read

Day 296: Skeletal System, Knees, Posture

3 min read

Day 314: Pathogens, Plague, Antibiotics, Antimicrobial Resistance

5 min read

Day 312: Immune System, Skin Cuts, Inflammation, Eczema, Rosacea, Psoriasis, Arthritis, Injuries, Lymphatic System, Sepsis, Autoimmune Diseases

4 min read

Day 301: Heart, Pulse, Cardiovascular System, Cardiovascular Health, Heart Disease, Heart Attack (Myocardial Infarction)

3 min read