code: func (b *Brain) Recall(d dep.Dependency) (interface{}, bool) {
  	b.RLock()
  	defer b.RUnlock()
  
  	// If we have not received data for this dependency, return now.
  	if _, ok := b.receivedData[d.String()]; !ok {
  		return nil, false
  	}
  
  	return b.data[d.String()], true
  }
docs: // Recall gets the current value for the given dependency in the Brain.