Field notes that follow from the photos.
-
Corollary
The n + 1 step: Max, the Sumatran elephant calf born in Madrid
A Sumatran elephant calf was born at the Zoo Aquarium de Madrid in August 2026. We met Max at six weeks old: facts, photos and tips.
-
Corollary
Proof by exhaustion: 14 species at the Parque Biológico da Serra da Lousã
What you can see at the Parque Biológico da Serra da Lousã (Miranda do Corvo): wolves, lynx, bears, owls and more. Our visit, 14 species and tips.
-
Corollary
How to photograph fog with a phone: a field guide in seven lemmas
Seven practical tips to photograph fog with your phone: exposure, focus, layers, light rays, condensation and gentle editing. With the physics behind each one.
-
Corollary
A candle in the Tagus: seeing the Bugio lighthouse from Praia da Rainha
Can you see the Bugio lighthouse from Costa da Caparica? Yes, 8.6 km away. Its history, the origin of its name, why haze hides it and the maths of horizons.
-
Corollary
Where’s the frog? Search problems in Salamanca
The frog on the University facade, the astronaut on the New Cathedral and the gold coin under 300 shells: how to find Salamanca’s hidden carvings, with maths.