Top 100 presentations

1. Continuous Verb Tenses
   35273
2. Support and transport in plants
   33762
3. Anyong Tubig Anyong Lupa sa Asya
   29268
4. Elements compounds and mixtures
   25952
5. Chromosome
   21924
6. Simple Verb Tenses
   20779
7. Atomic Structure
   20142
8. Balancing Chemical Equations. Balancing redox equations
   20085
9. Periodic Behavior
   19861
10. Newton’s laws of motion
    18807
11. Periodic Trends
    16726
12. Adverbs
    16626
13. Percent Composition, Empirical and Molecular Formulas
    15957
14. Animal Farm
    15750
15. Bonding, Molecular Shape & Structure
    14699
16. MakingFood
    13363
17. Circulation and Gas Exchange
    13363
18. DNA - An overview
    13004
19. Fungi
    12849
20. Atomic Structure and Periodic Trends
    12798
21. Volumetric
    12637
22. Feminism- Cure or Curse
    12527
23. Atomic Structure and Periodicity
    12454
24. Hormones and the Endocrine System
    12087
25. Animal Development
    11985
26. Derivation Applications of Bernoulli Principal
    11862
27. Osmoregulation and Excretion
    11420
28. Plasma Membrane-Gateway to the Cell
    10752
29. Plant Structure, Growth, and Development
    10654
30. Acid, bases and salts
    10205
31. Development
    10165
32. Mirrors and Lenses
    10097
33. Structure of the Atom
    9906
34. Balanced forces
    9878
35. Ancient Civilizations
    9787
36. Mass Spectrometry
    9739
37. Pronouns
    9717
38. Nouns
    9654
39. Resource Acquisition and Transport in Vascular Plants
    9441
40. Forests
    9364
41. Support and transport in plants
    9309
42. Atomic Structure
    9278
43. Cell Types and Cell Structure
    8975
44. Newton’s third law of motion
    8900
45. Animal Nutrition
    8660
46. Transplantation Immunology
    8592
47. Cellular respiration
    8486
48. Growing Plants
    8323
49. Sensory and Motor Mechanisms
    8288
50. Electrical Circuits
    8222
51. Plant Responses to Internal and External Signals
    8082
52. Lab Equipment
    8011
53. Prepositions
    7959
54. Viruses, Viroids, and Prions
    7861
55. Neurons, Synapses, and Signaling
    7828
56. Of Mice and Men
    7781
57. A Tour of the Cell
    7650
58. Basic Structure of a Cell
    7633
59. Real time PCR and it's functions in diagnosis
    7581
60. Covalent Bonding (Molecules)
    7569
61. Plant structure adaptations and responses
    7527
62. Ionic Bonding
    7432
63. Cellular Division
    7400
64. Mendelian Genetics
    7044
65. To Kill a Mockingbird
    7037
66. Blood Type Genetics
    6996
67. Satellite Orbits and Uses NIS
    6987
68. Molecules and Ions
    6899
69. Well logging The Bore Hole
    6872
70. Sound
    6822
71. The Immune System
    6790
72. Membrane Structure and Function
    6705
73. Animal Reproduction
    6674
74. The Chemistry of Acids and Bases
    6623
75. Angiosperm Reproduction and Biotechnology
    6610
76. Rocks
    6591
77. Plant Diversity
    6553
78. Mendel and the Gene Idea
    6509
79. Cell Communication
    6483
80. Balancing Chemical Equations
    6469
81. Rate Laws
    6343
82. Drama
    6306
83. Hybridization of Orbitals
    6286
84. Introduction to Oscillations and Simple Harmonic Motion
    6281
85. The Building Blocks of Matter Atoms
    6212
86. Empirical Formula
    6199
87. Electron Quantum Numbers
    6141
88. An Introduction to Metabolism
    6085
89. Translation. Protein from RNA
    6077
90. Neurons
    6014
91. The Structure and Function of Large Biological Molecules
    5914
92. The Mole
    5893
93. Cell Membrane + Tissues & Organs Definitions
    5857
94. Photosynthesis
    5852
95. Karyotypes
    5821
96. Earthquakes
    5819
97. ADP, ATP and Cellular Respiration
    5783
98. Endocrine System
    5745
99. Classical greek philosophy
    5655
100. Conjunction
     5613

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)