sS renderHowLongAgo(long timestamp) {
  int seconds = howManySecondsAgo(timestamp);
  if (seconds <= 0) ret "just now";
  if (seconds < 60) ret n2(seconds, "second") + " ago";
  int minutes = iround(seconds/60.0);
  if (minutes < 60) ret n2(minutes, "minute") + " ago";
  int hours = iround(minutes/60.0);
  if (hours < 24) ret n2(hours, "hour") + " ago";
  int days = iround(hours/24.0);
  ret n2(days, "day") + " ago";
}