These numbers define our universe. c = 299792458 m/s is exact by definition. So are µ₀ = 4π × 10⁻⁷ and ε₀ = 1/(µ₀c²). Yet G still carries 4.7 × 10⁻⁵ relative uncertainty, while α is known to 2.3 × 10⁻¹⁰. CODATA’s 2014 least-squares adjustment fused every precise measurement into one self-consistent set. Planck’s h, the elementary charge e, Avogadro’s N_A and the rest form the silent scaffolding of quantum mechanics, electromagnetism and statistical physics. Without them GPS clocks drift, quantum computers cannot calibrate, and the Boltzmann constant cannot convert temperature into energy. The constants are not decorations; they are the fixed points against which every physical law is measured. Which of these values most shapes the technology you build or study?

“E-I-E-I-O”: That's what 6-year-old Roman Heilman said when he spotted the horses that would carry him to safety after spending two days missing in the woods of eastern Kentucky. The boy, who has autism, emerged from the bushes with his dog following a massive search involving more than 300 volunteers.

e.l.f. Beauty - FY2027 Q2 Earnings $ELF $113.63 [+1.8% AH] ✅ Revenue: $520.8M (Est: $475.0M) [+51% YoY] ✅ EPS: $1.21 (Est: $0.60), adjusted, GAAP EPS $0.50 Additional Metrics: Gross Margin: 71% Operating Income: $52.4M [+579% YoY], GAAP Operating Margin: 10.1% Adjusted EBITDA: $123.4M [+86% YoY] Adjusted EBITDA Margin: 24% Adjusted Net Income: $72.7M [+78% YoY] Net Income: $30.0M, GAAP, year-ago $3.0M Adjusted SG&A: $275.1M [+42% YoY] Cash and Equivalents: $350.8M Total Debt: $826.7M FY2027 Guidance: ✅ Revenue: $2.003-2.029B (Est: $1.975B) (Prior: $1.938-1.968B) [+22-24% YoY] ✅ Adjusted EPS: $3.82-3.86 (Est: $3.69) (Prior: $3.50-3.55) ✅ Adjusted EBITDA: $421-427M (Est: $413.0M) (Prior: $401-407M) Adjusted Net Income: $231-233M (Prior: $212-215M)

E-2 has achieved steady expander cycle mode. In this test video, 30 seconds of expander cycle mode are demonstrated on the tail end of an 80-second test fire that began in Ox-Rich Staged Combustion (ORSC) mode. In expander mode, thrust was reduced from 23,000 lbf to 6,500 lbf, corresponding to a 28% throttle setting. To our knowledge E-2 is the first kerolox rocket engine to demonstrate a transition from ORSC to expander cycle operation on the same hardware during a test fire, thanks to our LOX cooled combustion chamber. This low throttle capability could be useful for landing burns by reducing thrust to weight ratio and providing greater flexibility to correct deviations from the planned landing trajectory.