{
  "topics": [
    { "id": "physics", "label": "Physics", "color": "teal" },
    { "id": "space",   "label": "Space",   "color": "rose",  "soon": true },
    { "id": "life",    "label": "Life",    "color": "blush", "soon": true },
    { "id": "earth",   "label": "Earth",   "color": "ok",    "soon": true },
    { "id": "mind",    "label": "Mind",    "color": "plum",  "soon": true }
  ],
  "explainers": [
    {
      "id": "ghosts-in-the-ice",
      "title": "Ghosts in the Ice",
      "topic": "physics",
      "url": "learn/ghosts-in-the-ice/",
      "summary": "How a block of Antarctic ice catches particles from black holes, and won the 2026 Nobel Prize in Physics.",
      "minutes": 25,
      "level": "Zero background",
      "interactives": 9,
      "video": true,
      "game": "Trace the Ghost",
      "published": "2026-10-09",
      "ideas": [
        { "id": "neutrino",    "label": "Ghost particles",            "desc": "What a neutrino is and why it passes through planets" },
        { "id": "cosmic-rays", "label": "Cosmic rays",                "desc": "The 1912 balloon mystery: particles raining from space" },
        { "id": "point-home",  "label": "Only neutrinos point home",  "desc": "Why light gets blocked and cosmic rays get bent" },
        { "id": "emc2",        "label": "E = mc²",                    "desc": "How a crash turns energy into brand-new particles" },
        { "id": "zoo",         "label": "The particle zoo",           "desc": "Everything else flying around in space" },
        { "id": "energy",      "label": "Cosmic accelerators",        "desc": "Particles hitting millions of times harder than our best machines" },
        { "id": "ice",         "label": "Why a km³ of ice",           "desc": "Size, darkness, clarity: the five tests a detector must pass" },
        { "id": "cherenkov",   "label": "Cherenkov light",            "desc": "The blue “speedboat wake” that sensors catch" },
        { "id": "game",        "label": "Trace the Ghost",            "desc": "Mini game: find where a neutrino came from", "kind": "game" }
      ]
    }
  ]
}