Library.

“If all the world's bacteria were stacked on top of each other, the resulting column would stretch approximately 10 billion light-years.”

The claim that stacked bacteria would stretch "10 billion light-years" is misleading. Using the most widely cited estimate of ~5×10³⁰ bacteria at ~2 µm average length, the stack reaches roughly 1 billion light-years — a full order of magnitude less. Even generous assumptions (including archaea) yield ~6 billion light-years. The only sources citing "10 billion" are popular trivia pages, while the original 1998 Whitman estimate actually claimed "a trillion light-years." The general concept of an astronomically vast distance is valid, but the specific figure is not mathematically supported.

“The continent of Africa has land in all four hemispheres: Northern, Southern, Eastern, and Western.”

The claim is true. Africa's landmass is crossed by both the Equator (dividing Northern and Southern Hemispheres) and the Prime Meridian (dividing Eastern and Western Hemispheres), placing it in all four hemispheres. This is confirmed by multiple credible geographic sources including WorldAtlas, Royal Museums Greenwich, and others. The East/West division relies on the conventionally chosen Prime Meridian at Greenwich, but this is the universally accepted standard in geography and cartography.

“There are more stars in the Milky Way galaxy than there are trees on Earth.”

This claim is false — it gets the comparison backwards. NASA and ESA estimate the Milky Way contains roughly 100–400 billion stars, while a landmark 2015 Yale/Nature study estimates approximately 3 trillion trees on Earth. Even using the highest credible star estimates, trees outnumber Milky Way stars by a factor of roughly 7 to 30. The popular belief that stars vastly outnumber trees is a common misconception.

“The Earth has a flat shape rather than a spherical shape.”

The claim is false. Multiple independent, repeatable observations (satellite/space imagery, Earth’s consistently round shadow during lunar eclipses, horizon and latitude/star-visibility effects, and circumnavigation) confirm Earth is an oblate spheroid. The cited sources unanimously refute flat-Earth arguments; no credible evidence in the record supports a flat Earth.

“Current atmospheric CO2 levels are not unprecedented when compared to levels found throughout Earth's full geological record.”

The claim is technically accurate: multiple peer-reviewed studies confirm CO2 exceeded 1,000–2,000 ppm during earlier geological periods (e.g., Mesozoic, Eocene), well above today's ~422 ppm. However, the claim omits critical context. Current CO2 is the highest in at least 14 million years, the rate of increase is roughly 100 times faster than any known natural rise, and deep-time CO2 estimates carry large uncertainties (±500 ppm). The literal statement is defensible, but its framing can create a misleading impression that today's levels are unremarkable.