text: const MODERN_ACTIVITY= 15;
  const HALF_LIFE_PERIOD= 5730;
  
  module.exports = function dateSample(sampleActivity) {
    if (typeof sampleActivity !== 'string' || isNaN(sampleActivity) || sampleActivity <= 0) return false;
    const result = Math.ceil(Math.log(MODERN_ACTIVITY / sampleActivity) / (0.693 / HALF_LIFE_PERIOD));
    return result >= 0 ? result : false;
  };
  